Freight truck sizes: dimensions, pallet capacity and legal limits for every type
Freight truck sizes decide what a load can be: how many pallets fit, how tall the freight can stand, how heavy it can get. This guide covers the 11 equipment types we dispatch, from the 26 ft box truck, our smallest, to 53 ft vans and step decks, with example inside dimensions, pallet capacity worked out from them, and the federal rules on width, trailer length and weight. Inside dimensions vary by maker and model, so treat the examples as starting points and check the spec plate on the truck you'll use.
Pick a type below for its example size, its floor capacity in standard pallets, and the rules that shape it.
Pick a type: inside size, pallet capacity, rule notes
The legal limits behind the sizes
Federal rules set the outer limits most freight trucks are built to. On the National Network, states must allow a vehicle width of 102 inches, no more and no less, with Hawaii keeping its own limit. For tractor-semitrailer combinations, states may not limit a semitrailer to less than 48 feet, and they can't set an overall length limit on the combination; many states allow longer trailers, and lengths allowed vary by state. On the Interstate, the gross weight limit is 80,000 pounds, with axle limits too. Height limits are set by the states.
Sources: 23 CFR 658.15(a), checked October 2026; 23 CFR 658.13(b)(1), checked October 2026; 23 CFR 658.17(b), checked October 2026
Freight that won't fit within the legal width, height, length or weight moves as an oversize or overweight load under state permits.
Freight truck sizes by type
| Type | Typical use | Notes on size |
|---|---|---|
| Box truck (26 ft) | Local and regional pallets, final mile, liftgate deliveries | Our smallest; no CDL needed at 26,000 lb GVWR or less |
| Car hauler | Vehicles between dealers, auctions and owners | Capacity counted in vehicles, not feet |
| Dry van (53 ft) | General freight, the most common truckload | Inside size varies by wall and floor design |
| Dump truck | Aggregate, sand, gravel, demolition | Body capacity in cubic yards; weight usually binds first |
| Flatbed (48 to 53 ft) | Building materials, steel, machinery | Open deck; width beyond the legal limit needs a permit |
| Hazmat and tanker | Placarded freight and bulk liquids | Tank capacity in gallons; product density limits fill |
| Hotshot | Smaller, time-critical loads | Pickup with a gooseneck, often around 40 ft of deck |
| Oversize | Loads over legal dimensions | RGN, lowboy and stretch trailers sized to the load |
| Power only | Preloaded trailers | The trailer belongs to the shipper or broker |
| Reefer (53 ft) | Food, produce, pharmaceuticals | Insulation makes it narrower and shorter inside |
| Step deck (48 to 53 ft) | Taller open-deck freight | A lower deck carries freight that's too tall for a flatbed |
How pallet capacity is worked out
Floor capacity is simple geometry. Divide the inside width by the pallet's width to see how many fit side by side, then divide the inside length by the pallet's length to get the rows. Standard 48 by 40 inch pallets can go straight, with the 48 inch side along the trailer, or turned, with the 40 inch side along it, which fits more rows when the width allows two 48s side by side. The trailer cube calculator works out volume and whether a load cubes or weighs out first.
Floor capacity is only half the answer. A load can fill the floor and be light, or reach the weight limit with floor to spare. Dense freight weighs out; light, bulky freight cubes out.
Every truck size fits some freight better than others. Our dispatchers match loads to your equipment's real dimensions and payload, and you approve every load.
See how dispatch worksStraight trucks vs tractor-trailers
A straight truck, like a 26 ft box truck, has the cargo body and the engine on one chassis. It turns tighter, fits city streets and docks that a tractor-trailer can't reach, and often needs no CDL when its weight rating is low enough. A tractor-trailer separates the power unit from the trailer, so one tractor can pull a van today and a flatbed tomorrow, and a trailer can be dropped and hooked. Straight trucks win on access and flexibility in town; tractor-trailers win on capacity and cost per mile on longer runs.
Weight ratings and CDLs
Size and weight ratings decide who can drive the truck. A single vehicle rated at 26,001 pounds or more needs a CDL, which is why so many box trucks are built to a 26,000 pound rating. Combinations follow their own thresholds. Weight ratings also cap payload: the rating minus the empty weight is what the truck can legally carry, and the max payload calculator works it out from your own numbers.
Source: 49 CFR 383.91, checked October 2026
Height, the forgotten dimension
Inside height decides whether freight can stack and how tall a machine can be. Vans and reefers have fixed inside heights set by their roofs and floors. Open decks have no roof, but the load's total height above the road is limited by the states, which is why step decks exist: their lower deck lets taller freight stay within height limits. Always check the height of the freight, the deck height and the route.
Measuring a trailer yourself
When a load is tight, measure. Run a tape along the floor from the front wall to the back of the door opening, across the floor between the walls at several points, and from the floor to the lowest point of the roof, usually near the door header. Note anything that sticks into the space: wall posts, logistic tracks, a reefer unit's air chute, wheel wells on a box. The door opening is often narrower and lower than the inside, and it decides what can be loaded at all.
Freight class and truck size
On LTL, freight class depends heavily on density, which is weight divided by the space the freight takes. That space is measured by the shipment, not the trailer, but it decides how much of a trailer the freight uses. Our guides to freight class, NMFC code lookup and the 2025 NMFC changes (coming soon) explain the shipper's side. Shippers who negotiate one class for mixed products, called freight all kinds, still depend on the freight fitting the truck.
Choosing the right size
Match the truck to the freight, not the other way round. Palletized dry freight in a full truckload: a 53 ft van. A few pallets to a business without a dock: a 26 ft box with a liftgate. Steel or lumber loaded from the side: a flatbed. A tall machine: a step deck. Food: a reefer. A small urgent load: a hotshot. The wrong truck is the most common reason a pickup fails.
What to check
We dispatch all 11 of these equipment types equally, with the 26 ft box as our smallest. See how our dispatch works, or send an application. You approve every load.