Short answer
A straight truck is a truck with its cab and cargo body mounted on one frame, so nothing detaches. Box trucks and most local delivery trucks are straight trucks. Common freight sizes run from 16 to 26 feet of box, with payloads from about 4,300 to 17,000 pounds. The driver needs a CDL once the truck’s weight rating reaches 26,001 pounds.
Brokers run into straight trucks on freight that’s too big for a cargo van and too small to justify a 53-foot trailer. That means a few pallets across town, an expedited shipment, or a delivery to a building with no dock. This post covers what counts as a straight truck, the sizes, and the rules that change with weight.
What counts as a straight truck
Straight truck is a trade term. Federal rules don’t define it. The Federal Highway Administration calls these vehicles single-unit trucks and describes them as “vehicles on a single frame” in its Traffic Monitoring Guide. FMCSA’s regulations define a truck as “any self-propelled commercial motor vehicle except a truck tractor, designed and/or used for the transportation of property” (49 CFR 390.5T).
The other kind of truck is a tractor, which pulls a trailer that unhooks. On a straight truck the cargo body is bolted to the same frame as the cab and the two never separate.
A box truck is the most common straight truck, and many people use the two names for the same thing. Penske’s rental site refers to its “26 ft. straight truck, aka box truck.” Straight trucks also come as flatbeds, refrigerated trucks and dump trucks.
Straight truck sizes and capacities
These are Penske’s published figures for its rental box trucks. Each one is an upper limit, and trucks from other fleets will differ.
| Box length | Inside, up to (length, width, height) | Gross weight, up to | Payload, up to | Cargo space |
|---|---|---|---|---|
| 12 ft | 12 ft by 6 ft 6 in by 6 ft 1 in | 9,900 lb | 3,100 lb | 450 cu ft |
| 16 ft | 16 ft by 7 ft 7 in by 6 ft 6 in | 12,500 lb | 4,300 lb | 800 cu ft |
| 22 to 26 ft, no CDL needed | 25 ft 11 in by 8 ft 1 in by 8 ft 7 in (26 ft truck) | 26,000 lb | 10,000 lb | 1,700 cu ft |
| 22 to 26 ft, CDL required | 25 ft 11 in by 8 ft 1 in by 8 ft 7 in (26 ft truck) | 33,000 lb | 17,000 lb | 1,700 cu ft |
Source: Penske Truck Rental pages for its 12-foot, 16-foot and 22 to 26-foot box trucks, read in October 2026.
On pallets, a 26-foot truck holds 12 standard 48-by-40-inch pallets in one layer, according to Mercer Transportation and Gebrüder Weiss. Penske says its 16-foot truck fits two rows of about four. Ryder lists its straight trucks at up to 13,000 pounds of load capacity.
Weight classes: where straight trucks sit
Trucks are sorted into eight classes by gross vehicle weight rating, the most the truck is built to weigh fully loaded. Most straight trucks in freight service fall in Classes 3 through 7.
| Class | Weight rating | Group |
|---|---|---|
| Class 3 | 10,001 to 14,000 lb | Medium duty |
| Class 4 | 14,001 to 16,000 lb | Medium duty |
| Class 5 | 16,001 to 19,500 lb | Medium duty |
| Class 6 | 19,501 to 26,000 lb | Medium duty |
| Class 7 | 26,001 to 33,000 lb | Heavy duty |
| Class 8 | Over 33,000 lb | Heavy duty |
Classes are set by the Federal Highway Administration. Chart from the U.S. Department of Energy’s Alternative Fuels Data Center.
Going by Penske’s ratings, its 16-foot box truck at 12,500 pounds is a Class 3. The 26-footer rated at 26,000 pounds is a Class 6, and the heavier 33,000-pound version is a Class 7. Highway tractors are Class 8.
When the driver needs a CDL
The line is 26,001 pounds. Under 49 CFR 383.91, a “heavy straight vehicle” is any single vehicle with a weight rating of 26,001 pounds or more, and driving one takes a Class B commercial driver’s license.
That rule explains the rental fleets. A 26-foot box truck rated at exactly 26,000 pounds can be driven on a regular license. The same body on a heavier chassis, rated at 33,000 pounds, carries 7,000 pounds more and needs a CDL driver.
The rating decides it. What the truck weighs on the day doesn’t. A truck rated at 33,000 pounds needs a CDL driver when it’s empty.
Rules that still apply without a CDL
A truck that doesn’t need a CDL can still be a commercial motor vehicle. FMCSA’s definition in 49 CFR 390.5T covers any vehicle used in interstate commerce with a weight rating or actual weight of 10,001 pounds or more. That takes in a 16-foot box truck rated at 12,500 pounds.
Above that line the carrier needs a USDOT number, and the safety rules apply, hours of service included. A for-hire carrier hauling freight across state lines also needs operating authority.
Insurance follows the same line. 49 CFR 387.9 sets the minimum at $750,000 for a for-hire carrier hauling non-hazardous freight in interstate commerce in a vehicle rated 10,001 pounds or more.
For a broker, that means a straight truck carrier gets vetted the same way a tractor-trailer carrier does. Our carrier onboarding guide has the checklist, and the MC number and cargo insurance entries explain what you’re looking at.
Straight truck vs. tractor-trailer
| Spec | 26-foot straight truck | 53-foot dry van |
|---|---|---|
| Pallets, one layer | 12 | 26 |
| Payload | 10,000 lb without a CDL, up to 17,000 lb with one | 42,000 to 45,000 lb |
| Cargo space | Up to 1,700 cu ft | About 4,050 cu ft |
| Inside height | 8 ft 7 in (103 in) | 110 in |
| Overall height | 13 ft 6 in | 13 ft 6 in |
| Getting freight on and off | Liftgate rated up to 3,000 lb on Penske’s trucks. Floor sits 46 to 50 in off the ground | Floor sits about 49 to 50 in off the ground |
| License | Regular license up to a 26,000 lb rating. Class B CDL above it | Class A CDL |
Straight truck figures from Penske. Dry van figures from our 53-foot trailer dimensions post.
When a straight truck is the right call
A straight truck earns its place on small, local or awkward freight.
- The shipment is 12 pallets or fewer and light enough for the truck.
- The delivery has no dock, and a liftgate can set the freight on the ground.
- The street or the lot is too tight for a 53-foot trailer.
- The freight is urgent and you want it on its own truck with no terminal stops.
It’s the wrong call when the freight is dense. Twelve pallet positions and 10,000 pounds of payload works out to an average of 833 pounds a pallet. Six pallets of bottled water, at about a ton apiece, will overload a truck with half its floor empty.
If the shipment can ride with other freight and the timing is loose, get an LTL quote too. For a heavier small load that has to move fast on an open deck, see hot shot trucking.
Four mistakes when booking a straight truck
- Quoting on pallet count without the weight. Payload runs out long before floor space does.
- Assuming the truck has a liftgate. Ask, and ask what it’s rated for. A 3,000-pound liftgate has to lift the pallet and the pallet jack together.
- Forgetting the height. A box that’s 8 feet 7 inches inside is seven inches shorter than a dry van, and the door opening is smaller again.
- Treating a truck that doesn’t need a CDL as unregulated. At 10,001 pounds in interstate commerce, the carrier has federal registration, insurance and hours-of-service rules to meet.
Put the truck size, the liftgate and the weight on the rate confirmation, the same as you would for any other equipment.
Final thoughts
Think of a straight truck as 12 pallets and five tons, with a liftgate if you ask for one. Inside those limits it’s often the simplest way to move a small shipment. Outside them, price a dry van or LTL. Our LTL vs. FTL guide covers that choice.