Intermodal Trucking Equipment: Chassis, Containers & What You Need

Twistlocks (marine chassis) — Metal locking pins that insert into the container's corner castings and twist 90 degrees to lock. Four twistlocks secure each container — one at each corner. Some chassis have automatic twistlocks that engage when the container is lowered onto the chassis. Manual twistlocks require the driver to physically engage and lock each one. Always verify all four locks are fully engaged before moving.

Kingpin connection (domestic gooseneck) — 53-foot domestic containers have a kingpin at the front that connects to the gooseneck chassis — identical to how a standard trailer connects. The container's rear sits on the chassis bogies with pins or bolsters. This system is familiar to any driver who has pulled a standard trailer.

Corner castings — Standardized ISO fittings at all eight corners (four top, four bottom) of marine containers. Bottom corner castings interface with twistlocks on the chassis. Top corner castings are used by cranes and spreader bars for lifting. These are the same on every ISO container worldwide.

Day cab preferred — Since intermodal drivers are home nightly, a sleeper is unnecessary weight. A day cab is 2,000-4,000 lbs lighter, which translates directly into more payload capacity. On heavy containers near the 80,000 lb GVWR limit, those extra pounds matter. Day cabs also cost less to purchase and insure.

Standard fifth wheel — Connects to the chassis kingpin the same way as any trailer. No special fifth-wheel modifications needed. Make sure your fifth wheel is properly lubricated and adjusted for the chassis height.

Adequate wheelbase — Intermodal work involves a lot of tight turns in railyards, port terminals, and warehouse yards. A shorter wheelbase (180"-210") improves maneuverability in tight spaces compared to longer-wheelbase highway tractors.

Good braking system — Loaded intermodal containers can be extremely heavy (up to 80,000 lbs gross). Strong brakes, ABS, and stability systems are important — especially in urban traffic and on hilly terrain between railyards and delivery locations.

Pre-trip every chassis — Whether it is your own or a pool chassis, inspect tires, brakes, lights, reflectors, frame, and twistlocks before every move. DOT does not care if it is a rental — if the chassis is unsafe, the citation goes on your record.

Document pool chassis condition — Photograph any existing damage on a pool chassis before you leave the ramp. Note it on the interchange receipt. If the chassis pool later charges you for pre-existing damage, your photos are evidence that it was not your fault.

Reject unsafe pool chassis — You have the right to reject any pool chassis that is unsafe. Do not let time pressure push you into hauling on a chassis with bald tires or broken lights. A DOT roadside inspection failure costs far more than the time spent swapping chassis.

Own-chassis maintenance schedule — If you own your chassis, follow a regular maintenance schedule: tire rotation every 6 months, brake inspection every 3 months, light check weekly, and frame/weld inspection annually. Well-maintained chassis have 15-20 year service lives.