What is an RGN Trailer?
An RGN (Removable Gooseneck) trailer is a specialized heavy-haul trailer whose front gooseneck section detaches hydraulically, lowering the front of the deck to ground level so that heavy equipment can drive directly onto the trailer. RGNs are the go-to trailer for hauling heavy haul loads like excavators, bulldozers, cranes, and other oversized machinery that exceeds the capacity of a standard flatbed or step deck. With capacities ranging from 42,000 lbs on a standard 2-axle up to 150,000+ lbs on multi-axle configurations, RGN trailers handle the heaviest and most oversized freight on American highways.
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5+ years dispatching heavy haul and oversized loads, coordinating RGN shipments, permits, and escort vehicles across all 48 contiguous states
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O TruckingWhat is an RGN Trailer? Removable Gooseneck Definition & Guide for Trucking
What Is an RGN Trailer?
RGN stands for Removable Gooseneck. It is a type of heavy-haul trailer specifically designed to transport oversized and overweight equipment that cannot fit on a standard flatbed, step deck, or fixed-gooseneck lowboy trailer.
The defining feature of an RGN is the detachable gooseneck — the front section that connects the trailer to the tractor's fifth wheel. On a standard lowboy or step deck, the gooseneck is permanently welded to the trailer frame. On an RGN, the gooseneck disconnects hydraulically, allowing the front of the trailer to drop to ground level. This creates a gentle ramp that equipment can drive up under its own power — no crane required.
RGN trailers are built for the most demanding freight in the trucking industry. They are the primary trailer type used for:
- Construction equipment — excavators, bulldozers, wheel loaders, motor graders, backhoes, compactors, and pavers
- Tracked machinery — track hoes, track loaders, and military tracked vehicles that cannot travel on public roads
- Cranes — small mobile cranes, crane components, and disassembled large crane sections
- Industrial equipment — generators, transformers, large HVAC units, and manufacturing machinery
- Agricultural equipment — combines, harvesters, and large tractors that exceed legal road dimensions
- Military vehicles — tanks, armored personnel carriers, and other defense equipment
The combination of a low deck height (18-24 inches), drive-on loading capability, and high weight capacity makes the RGN the most versatile trailer in the heavy haul segment. While more expensive to operate than flatbeds or step decks, RGN trailers handle loads that no other trailer type can safely accommodate.
RGN Trailer at a Glance
Standard Length
48 ft overall, 26-30 ft well
Deck Height
18-24 inches (well section)
Weight Capacity
42K lbs (2-axle) to 150K+ lbs (20-axle)
Key Feature
Hydraulic detachable gooseneck for drive-on loading
How the Removable Gooseneck Works
The hydraulic detach system is what makes an RGN different from every other trailer in the heavy haul category. Understanding the loading process explains why RGN trailers command higher rates and why they are preferred for self-propelled equipment.
Tractor Pulls Forward to Disconnect
The driver positions the rig at the loading site. The hydraulic release is activated — either from a control box on the trailer or from inside the cab, depending on the trailer manufacturer. The locking pins retract, and the tractor pulls forward slowly, separating the gooseneck from the main trailer deck.
Front of Trailer Lowers to Ground
With the gooseneck disconnected, the front end of the main deck lowers to ground level using hydraulic cylinders. This creates a gradual incline from ground level up to the well deck height of 18-24 inches. The resulting ramp angle is gentle enough for tracked and wheeled equipment to drive up safely without high-centering.
Equipment Drives Onto the Deck
The operator drives the equipment — an excavator, dozer, loader, or other self-propelled machine — directly onto the trailer from the front. This eliminates the need for a crane, which saves significant time and money at the loading site. Most pieces of heavy equipment can load in 5-15 minutes using the drive-on method.
Gooseneck Reattaches
Once the equipment is positioned and secured with chains and binders, the tractor backs up to the trailer. The gooseneck reconnects to the main deck using the hydraulic locking pins. The front of the trailer lifts back to travel height, the airline and electrical connections are re-established, and the rig is ready to roll. The entire loading process — detach, load, reattach — typically takes 20-45 minutes depending on the equipment.
For a detailed breakdown of the hydraulic detach system, maintenance requirements, and operator tips, see our guide to how the RGN gooseneck works.
Never Detach the Gooseneck on Uneven Ground
RGN Trailer Dimensions
RGN trailers come in several configurations, each suited to different load sizes and weights. The three main categories are standard, stretch, and multi-axle:
| Specification | Standard RGN | Stretch RGN | Multi-Axle RGN |
|---|---|---|---|
| Overall Length | 48 ft | Up to 74 ft | 48-65 ft |
| Well Length | 26-30 ft | 29-61 ft | 24-35 ft |
| Well Deck Height | 18-24 in | 18-24 in | 18-24 in |
| Width | 8 ft 6 in | 8 ft 6 in | 8 ft 6 in - 12 ft |
| Back Deck Length | 10-13 ft | 10-13 ft | 10-15 ft |
| Typical Axles | 2-3 | 2-3 | 5-20 |
| Weight Capacity | 42K-54K lbs | 42K-54K lbs | 80K-150K+ lbs |
The well is the lowest section of the RGN trailer, sitting between the gooseneck and the rear axles. This is where the heaviest portion of the equipment sits, keeping the center of gravity as low as possible for safe transport. The well deck height of 18-24 inches gives the maximum vertical clearance for tall equipment while staying under the 13'6" legal height limit in most states.
The back deck (also called the beaver tail or tail section) sits behind and above the rear axles, at a height of approximately 36-48 inches. This elevated section is used for lighter auxiliary items — toolboxes, smaller attachments, or the counterweight section of equipment that overhangs the well.
For a complete breakdown of every dimension, including stretch specifications and clearance calculations, see our RGN trailer dimensions guide.
Calculate Vertical Clearance Before Booking
RGN Trailer Weight Capacity by Axle Count
The weight an RGN trailer can legally haul depends primarily on the number of axles. More axles spread the load across more contact points, which satisfies the Federal Bridge Formula and state weight restrictions. Here is how capacity scales with axle count:
| Trailer Axles | Total Axles (w/ Tractor) | Approx. Payload Capacity | Permits Required? |
|---|---|---|---|
| 2 axle | 5 total | 42,000-44,000 lbs | Usually no (under 80K GVW) |
| 3 axle | 6 total | 52,000-54,000 lbs | Depends on GVW |
| 5 axle | 8 total | 80,000-90,000 lbs | Yes — overweight |
| 7-9 axle | 10-12 total | 100,000-120,000 lbs | Yes — overweight + escorts |
| 13-20 axle | 16-23 total | 120,000-150,000+ lbs | Yes — superload permits, engineering |
The Federal Bridge Formula governs the maximum weight allowed per axle group based on the number of axles and the distance between the first and last axle. This formula exists to protect bridges and roadway infrastructure from concentrated weight damage. Adding more axles spreads the weight across a longer span, allowing the trailer to carry more total weight while staying within per-axle limits.
For a detailed breakdown of weight capacity calculations, permit thresholds by state, and how to determine the right axle configuration for your load, see our RGN trailer weight capacity guide.
Trailer Tare Weight Reduces Payload
RGN vs Lowboy: What's the Difference?
RGN trailers and lowboy trailers are both low-deck heavy-haul trailers, and the terms are sometimes used interchangeably — but they are not the same. The critical difference is the gooseneck:
| Feature | RGN Trailer | Lowboy (Fixed Gooseneck) |
|---|---|---|
| Gooseneck | Removable (hydraulic detach) | Fixed (welded) |
| Loading Method | Drive-on from front | Crane load or drive over gooseneck |
| Typical Well Length | 29-53 ft | 24-29 ft |
| Weight Capacity | 42K-150K+ lbs | 40K-80K lbs |
| Deck Height | 18-24 in | 18-24 in |
| Best For | Self-propelled equipment, oversized loads | Crane-loaded items, shorter equipment |
| Hauling Rate | Higher (due to complexity) | Lower than RGN |
The drive-on loading capability is the primary advantage of an RGN over a lowboy. When you are hauling an excavator from a construction site, there is usually no crane available to lift it onto a fixed-gooseneck lowboy. The RGN solves this — the equipment drives itself on. This eliminates crane rental costs (often $500-$2,000+ per lift) and the scheduling delays of waiting for a crane to arrive on site.
The tradeoff is that RGN trailers cost more per mile due to the additional mechanical complexity of the hydraulic detach system. An RGN also requires a more experienced driver who knows how to safely operate the detach, load equipment, and properly secure irregular-shaped machines. For a full comparison, see our RGN vs lowboy guide.
When a Lowboy Is Actually the Better Choice
RGN Trailer Permits and Regulations
Most loads hauled on RGN trailers are oversized, overweight, or both. Understanding when permits are required — and what they cost — is essential for accurate pricing and legal compliance.
When Permits Are Required
Overweight — Any load where the gross vehicle weight (tractor + trailer + cargo) exceeds 80,000 lbs requires an overweight permit in all states. This is the most common permit type for RGN loads.
Overwidth — Loads exceeding 8'6" (102 inches) in width require an overwidth permit. Many pieces of heavy equipment exceed this — a standard excavator bucket is often 10-12 feet wide.
Over-height — Loads exceeding 13'6" (162 inches) require an over-height permit. The low deck height of an RGN helps avoid this, but tall equipment like excavators with cabs can still exceed the limit.
Over-length — Most states restrict total vehicle length to 53-65 feet without a permit. Stretch RGN trailers at 74 feet always require over-length permits, and even standard 48-foot RGNs can exceed limits when combined with certain tractor configurations.
Permit Costs and Timelines
Permit costs vary significantly by state. A single-trip overweight permit might cost $15-$100 in one state and $200-$500 in another. Multi-state loads crossing 3-5 state lines can accumulate $500-$2,000+ in permit fees alone. Processing times range from same-day (for standard oversize in many states) to 2-4 weeks (for superloads requiring route surveys and bridge analysis).
For a detailed breakdown of permit requirements by state, escort vehicle rules, and how to obtain permits, see our RGN trailer permits and regulations guide.
Escort Vehicle Requirements Vary by State
RGN Trailer Hauling Rates
RGN trailer rates are significantly higher than standard flatbed or step deck rates because of the specialized equipment, higher insurance costs, permit fees, and the skill required to operate. Here is a general rate framework:
| Load Type | Per-Mile Rate | 500-Mile Example | Includes |
|---|---|---|---|
| Standard RGN (under 80K GVW) | $3.50-$6.00 | $1,750-$3,000 | No permits needed |
| Oversize only (permitted) | $5.00-$8.00 | $2,500-$4,000 | Oversize permits + 1 escort |
| Overweight (80K-120K GVW) | $6.00-$12.00 | $3,000-$6,000 | OW permits + possible escorts |
| Superload (120K+ GVW) | $10.00-$20.00+ | $5,000-$10,000+ | Permits, escorts, route surveys, bridge analysis |
These rates represent the all-in cost to the shipper. The carrier's actual revenue per mile after subtracting permit fees, escort costs, and fuel is lower. Many heavy haul carriers quote a base hauling rate plus separate line items for permits and escorts, so the customer sees exactly what each component costs.
Factors that push RGN rates higher include:
- Permit complexity — Multi-state loads requiring permits in 3-5 states add $500-$2,000 in permit fees alone
- Escort vehicles — Each escort car adds $1.50-$3.00/mile, and some loads require two escorts
- Route restrictions — Oversize loads cannot use all roads, which may add miles to the route
- Travel time restrictions — Many states prohibit oversize load travel at night, on weekends, or on holidays, which slows delivery
- Deadhead — RGN trailers often deadhead empty to the next load because matching return freight is harder for specialized equipment
- Insurance premiums — Heavy haul insurance costs significantly more than standard trucking insurance
For a detailed breakdown of pricing factors, how to calculate all-in costs, and why RGN rates exceed flatbed and lowboy rates, see our RGN trailer rates guide.
How Our Dispatch Team Handles RGN Loads
Heavy haul dispatch is more complex than standard freight. At O Trucking LLC, we handle the details that make RGN loads profitable and legal:
Permit coordination across all states
We handle oversize and overweight permit applications for every state on the route. We know which states process same-day and which require advance notice. We factor permit costs into the rate before booking so there are no surprises after the load is on the trailer.
Escort vehicle scheduling
When escort vehicles are required, we coordinate scheduling with certified pilot car companies along the route. We confirm escort availability before committing to a delivery date, because nothing delays a heavy haul shipment faster than waiting for an escort car to become available.
Accurate rate quoting
We calculate all-in rates that include base hauling, permits, escorts, fuel surcharge, and any accessorial charges. Our carriers know exactly what they will earn before accepting a load, and shippers get a transparent quote with no hidden fees. Heavy haul is not a market where surprises are acceptable.
Route planning for oversize loads
Oversize loads cannot take the shortest route — they must avoid low bridges, narrow roads, weight-restricted bridges, and construction zones. We plan routes that comply with every permit restriction and minimize detour miles, saving our carriers time and fuel.
Related Resources
Flatbed Trailer
Standard open-deck freight trailer
Step Deck Trailer
Drop-deck trailer for taller loads
Heavy Haul
Oversized and overweight freight
Deadhead Miles
Running empty between loads
Overweight Truck Penalties
Fines for exceeding legal weight limits
Reduce Deadhead Miles
Strategies to find return loads
RGN Trailer Guide Collection
RGN vs Lowboy
Which trailer for heavy haul?
RGN Dimensions
Standard, stretch & multi-axle specs
Weight Capacity
42K to 150K+ lbs by axle count
Stretch RGN Trailers
Extended length for oversized loads
Permits & Regulations
Oversize load rules by state
How the Gooseneck Works
Hydraulic detach, loading & operation
RGN Trailer Rates
What heavy haul transport costs
RGN Trailer FAQ
Common questions about RGN trailers, dimensions, weight capacity, permits, and heavy haul transport
What does RGN stand for in trucking?
RGN stands for Removable Gooseneck. It refers to a heavy-haul trailer whose front gooseneck section detaches hydraulically, allowing the front of the trailer to lower to ground level. This creates a ramp so that equipment — excavators, bulldozers, cranes, and other heavy machinery — can drive directly onto the trailer deck under its own power. The detachable gooseneck is what separates an RGN from a standard lowboy trailer, which has a fixed gooseneck and requires crane loading.
How much weight can an RGN trailer carry?
RGN trailer weight capacity depends on the number of axles. A standard 2-axle RGN can legally haul approximately 42,000-44,000 lbs. A 3-axle RGN handles about 52,000-54,000 lbs. Multi-axle configurations with 5-9 axles can carry 80,000-100,000 lbs, and specialized 13-20 axle RGNs used for superloads can carry over 150,000 lbs. Any load exceeding 80,000 lbs gross vehicle weight requires overweight permits in all states, and loads over about 120,000 lbs may require route engineering and bridge analysis.
What is the difference between an RGN and a lowboy trailer?
The primary difference is the gooseneck. An RGN has a removable (detachable) gooseneck that disconnects hydraulically, allowing the front of the trailer to drop to ground level for drive-on loading. A lowboy (also called a low-bed) has a fixed gooseneck, which means equipment must be loaded by crane or driven up a ramp over the gooseneck. RGNs typically offer longer well lengths (29-53 ft vs 24-29 ft for lowboys) and higher weight capacities. RGNs cost more to operate but handle a wider range of heavy equipment. See our RGN vs lowboy comparison for a detailed breakdown.
What are standard RGN trailer dimensions?
A standard (non-stretch) RGN trailer is approximately 48 feet in overall length with a 26-30 foot well (the lowest section where equipment sits). The well deck height is 18-24 inches from the ground, depending on tire size and suspension. The gooseneck section adds another 8-10 feet forward of the well. Overall width is 8 feet 6 inches (standard legal width). Most states restrict overall load height to 13 feet 6 inches, which gives you roughly 12 feet of vertical clearance for the equipment sitting in the well. Stretch RGN trailers can extend to 74 feet total, with a well length of 29-61 feet.
Do you need a permit to haul with an RGN trailer?
It depends on the load dimensions and weight. If your total gross vehicle weight stays under 80,000 lbs, your load width is under 8 feet 6 inches, your load height is under 13 feet 6 inches, and your overall length is under the state limit (typically 53-65 feet depending on the state), you do not need an oversize/overweight permit. However, most loads hauled on RGN trailers exceed at least one of these thresholds. Overweight permits are required for any load over 80,000 lbs GVW. Oversize permits are required for loads exceeding 8 feet 6 inches wide, 13 feet 6 inches tall, or the state length limit. Many RGN loads require both oversize and overweight permits, plus escort vehicles for the widest and heaviest loads.
How much does it cost to ship with an RGN trailer?
RGN trailer rates vary widely based on load weight, dimensions, distance, permits required, and escort vehicle needs. As a general range, expect to pay $3.50-$8.00+ per mile for standard RGN loads (under 80,000 lbs) and $8.00-$20.00+ per mile for permitted oversize/overweight loads. A typical 500-mile RGN haul for a 60,000 lb piece of equipment might cost $3,000-$5,000. A superload over 100,000 lbs requiring permits, escorts, and route surveys could cost $15,000-$50,000+ for the same distance. Permit fees, escort vehicles ($1.50-$3.00/mile each), and route engineering all add to the base hauling rate.
What types of equipment are hauled on RGN trailers?
RGN trailers are designed for heavy equipment that can drive onto the trailer under its own power. Common loads include excavators, bulldozers, wheel loaders, motor graders, track hoes, compactors, pavers, milling machines, cranes (disassembled or small mobile cranes), large generators, transformers, industrial machinery, military vehicles, and agricultural equipment like combines. The RGN is particularly useful for tracked equipment (excavators, dozers) because the low deck height and drive-on loading eliminates the need for crane lifts. Equipment that cannot self-load — like large structural steel or precast concrete — is typically hauled on flatbeds or standard lowboys instead.
Need Heavy Haul Dispatch for RGN Loads?
Our dispatch team coordinates RGN shipments including permit applications, escort vehicles, route planning, and rate negotiation. We handle the complexity so you can focus on hauling.