A chassis is the wheeled steel trailer frame that a truck uses to carry an intermodal shipping container over the road. Because ocean and rail containers have no wheels of their own, the container is locked onto a chassis so it can be pulled by a tractor. Without a chassis, a container cannot move by truck — which makes the chassis one of the most important and most overlooked pieces of equipment in drayage.
How a chassis works
The container is lifted onto the chassis and secured with twist locks at each corner. The chassis provides the axles, wheels, brakes, and lighting that make the combined unit street-legal. Chassis are sized to match container lengths — typically 20-foot, 40-foot, or adjustable (extendable) models that handle multiple sizes, plus specialized tri-axle chassis for heavy loads.
Who supplies the chassis?
Chassis provisioning is a frequent source of confusion and cost. Equipment can come from chassis pools shared among carriers, from leasing companies, from the ocean carrier, or from the trucking company’s own fleet. When a carrier relies on third-party pools, container moves can stall waiting for an available, roadworthy chassis — and split billing for the chassis often surprises shippers.
Why owning a chassis pool matters
Carriers that operate their own chassis pool avoid that bottleneck. Go Freight maintains its own chassis pool alongside 100+ owned trucks, so drayage moves out of PortMiami and Port Everglades are not held hostage to third-party equipment shortages. That control translates into more predictable pickup times and fewer surprise fees. See how it fits into our drayage services.
Common chassis types
- Standard chassis — fixed-length frames for 20-foot or 40-foot containers.
- Extendable (slider) chassis — adjust to carry multiple container lengths.
- Tri-axle chassis — extra axle to legally carry heavier loads.
- Gooseneck and lightweight chassis — designed to maximize payload within weight limits.
Chassis and accessorial charges
Chassis tie directly into costs shippers see on invoices. Chassis usage or split fees, plus per diem and detention when equipment is held too long, can add up quickly. Returning chassis and containers promptly — often through transloading near the port — keeps these charges down.
Frequently asked questions
What is the difference between a chassis and a container?
A container is the steel box that holds the freight. A chassis is the wheeled frame that the container sits on so a truck can pull it over the road. The two are separate pieces of equipment.
Who pays for the chassis?
It depends on the agreement. Chassis can be supplied by pools, leasing companies, ocean carriers, or the trucking company. Costs are often passed to the shipper as a chassis or split fee, which carriers with their own pool can simplify.
Why is chassis availability a problem in drayage?
When roadworthy chassis are in short supply, containers cannot be picked up on time, causing delays and demurrage. Carriers that own their chassis pool avoid relying on scarce third-party equipment.
Ready to move freight smarter? Get a fast, asset-based quote from Go Freight — Miami’s AI-powered 3PL with 100+ owned trucks, our own chassis pool, and a 104,000 sq ft bonded Miami warehouse. Request a quote or call (786) 445-0150.