Commercial Truck Classes by GVWR: Payload, Specs and Weight Lines

If you’re buying your first work truck or taking over a fleet, the jargon comes fast: Class 6, GVWR, GCWR, CA, upfit. Commercial truck classes by GVWR are the place to start, because a truck’s weight rating decides who can drive it, how much it can carry and which taxes and inspections apply.

This guide is for first-time buyers and new fleet coordinators in Central New Jersey and beyond who are deciding between a cargo van, a Class 4–5 cabover, a Class 6 conventional and a Class 7 truck, or planning an upfit on a cab-and-chassis. Regulatory thresholds are as of November 2026. Confirm them with FMCSA, the IRS, the NJ MVC or your CPA.

The 8 commercial truck classes by GVWR, and where medium duty starts and ends

Truck classes are set by gross vehicle weight rating, using bands published by the US Department of Energy and the Federal Highway Administration. FHWA groups Classes 3 through 6 as medium duty and Classes 7 and 8 as heavy duty. In everyday dealer talk you’ll also hear Class 7 trucks such as the Hino L7 called medium duty. What matters for your licensing, taxes and inspections is the rating on the door label, not the label in a brochure.

Here are the eight classes:

• Class 1–2: light duty, up to 10,000 lb (pickups, vans and SUVs)
• Class 3: 10,001–14,000 lb
• Class 4: 14,001–16,000 lb
• Class 5: 16,001–19,500 lb
• Class 6: 19,501–26,000 lb
• Class 7: 26,001–33,000 lb
• Class 8: 33,001 lb and up

GVWR, GCWR, curb weight and payload: four numbers to keep straight

Most spec mistakes come from mixing these up:

• GVWR (gross vehicle weight rating): the manufacturer’s maximum loaded weight for the truck
• GCWR (gross combination weight rating): the maximum for the truck plus whatever it tows
• Empty weight: what the finished truck actually weighs with its body, fuel and equipment
• Payload: GVWR minus the empty weight, driver and equipment, which is what’s left for cargo

Spec’ing from the job backward: load, body, wheelbase and cab-to-axle

Brochure payload figures for a bare chassis don’t account for the body, liftgate, reefer unit, toolboxes or crew. That’s why the best way to spec a work truck is to start with what you carry and work backward to the truck:

• Load: your heaviest regular load by weight, and your bulkiest by volume
• Body: box, reefer, dump, flatbed, stake or hooklift, and the length the load needs
• Cab-to-axle (CA): the distance from the back of the cab to the center of the rear axle, which body builders use to match a body length to a chassis
• Wheelbase: follows from the CA and cab choice, and affects how the truck turns in tight lots and streets
• GVWR: enough rating for the body plus the load, with some margin

Buying a cab-and-chassis to upfit

A cab-and-chassis is a truck sold without a body, so one can be mounted to suit the job. Three parties are usually involved: you bring the job, the dealer supplies the chassis and its specs, and the body builder designs and mounts the body. Getting CA wrong means a body that doesn’t fit, or weight that lands in the wrong place on the axles, so the body conversation should happen before the chassis is ordered.

Plan the timeline as well. A chassis has to be available, the body built or sourced and the truck finished before it can go to work. If timing matters, whether that’s a contract start date, a season or a tax year, say so up front. Our fleet team coordinates body and upfit work.

Weight lines that change your costs

Several federal and New Jersey rules switch on at specific weights. These are the ones that most often affect medium-duty buyers, as of November 2026:

• 10,001 lb: interstate carriers need a USDOT number, and for-hire interstate carriers of general freight need at least $750,000 in liability coverage
• 18,000 lb: NJ’s annual diesel smoke-opacity inspection applies to diesel vehicles at this GVWR and above
• 26,001 lb: the federal CDL threshold for a single truck (our non-CDL guide covers the details and the trailer rule)
• Over 33,000 lb: the federal 12% retail excise tax on truck chassis and bodies applies, and the truck is Class 8
• 55,000 lb taxable gross weight: the federal heavy vehicle use tax applies, filed on IRS Form 2290

A real example, and common NJ use cases by class

The Hino L6 (rated up to 25,950 lb) and L7 (33,000 lb) show how these lines work: the L6 sits under the CDL line and the L7 sits right at the excise-tax line. Ask our sales team to confirm the tax treatment of any specific build, and confirm requirements for your own operation with FMCSA, the IRS, the NJ MVC and your CPA.

Our inventory categories follow similar lines: box trucks in Classes 4–6, reefers in 5–7, dump trucks in 6–8, landscape dumps in 4–5, stake bodies in 4–6 and cab-and-chassis from Class 4 to 8. Typical work by class looks like this:

• Cargo vans: service trades, small parcels and tight streets in older Shore towns
• Class 4–5 box trucks and cabovers: local delivery, contractors and landscape dumps
• Class 6 box and reefer trucks: food distribution, moving and multi-stop delivery with non-CDL drivers
• Class 7 dump and flatbed trucks: stone, soil and heavier construction material with CDL drivers

Not sure which class fits? Bring your spec sheet or load list

Send us your heaviest load, your body plan, whether you tow and which licenses your drivers hold. Our sales team will help you narrow it down to a class and a spec, new or used, and our finance desk can show how the options fit your budget. Schwartz Truck Center serves operators across New Jersey, New York, Pennsylvania and Connecticut from 585 Shrewsbury Ave.

Common questions