How to read a truck's towing sticker: GVWR, GCWR, payload and tongue weight

Every pickup has a sticker on the driver's door jamb covered in acronyms. Those numbers, not the biggest figure in the ad, decide what you can safely haul. Here is what each one means, in the order you need them.

The ratings, one at a time

These definitions come from the Government of Alberta's Recreational Vehicle Towing Guide. Manufacturers set the ratings to standards set by Transport Canada.

Rating	What it means	Where to find it
GVWR Gross Vehicle Weight Rating	The most the truck is designed to weigh in total: the truck itself plus passengers, fuel, cargo and accessories.	Driver's door sticker
GAWR Gross Axle Weight Rating	The most each axle (front and rear) is designed to carry.	Driver's door sticker
GCWR Gross Combination Weight Rating	The most the truck and trailer can weigh together. It can change with the engine, transmission and axle ratio.	Usually the owner's manual or the maker's towing guide
Net (curb) weight	The truck empty, apart from a full tank of fuel, oil and coolant.	Spec sheet, or weigh it
GVW Gross Vehicle Weight	What your loaded truck actually weighs: add up the weight on every axle.	A scale

A quick tip from the same guide: the front and rear axle ratings added together will always be more than the GVWR. That doesn't mean you can load to the axle totals. Alberta recommends you stay under all three: GVWR, front GAWR and rear GAWR.

Payload: the number most people miss

Payload is how much weight you can put in or on the truck. Alberta's guide gives the formula:

Payload = GVWR − net (empty) weight

The guide's own example uses a truck with a GVWR of 5,171 kg and a weighed net weight of 2,600 kg. That leaves a payload of 2,571 kg. Everything below counts against that number:

• the driver and every passenger
• tools, gear, a toolbox, a canopy, a fuel transfer tank
• the hitch itself
• the trailer's tongue weight (or the kingpin weight of a fifth wheel or gooseneck)

That last item catches a lot of people. As Alberta's guide puts it, a coupled trailer transfers weight to the towing vehicle, so you have to count it when you check the GVWR and axle ratings.

Towing capacity assumes an empty truck

The "maximum trailer towing capacity" you see advertised is, in Alberta's words, the most a truck can tow "when your truck is empty (no payload)". Any load you carry in the truck reduces it. Manufacturers make similar assumptions. Chevrolet's 2026 Canadian trailering guide, for example, calculates maximum trailer weight as GCWR minus the truck's curb weight, with 150 lb (about 68 kg) each for a driver and one passenger.

So a crew cab carrying four adults, a full box of gear and a hitch will tow less than the brochure says. The safe way to think about it: your real towing limit is whichever of these you hit first:

1. the truck's GCWR (truck plus trailer, all loaded),
2. the truck's GVWR (including tongue weight),
3. either axle's GAWR,
4. the hitch's rating, and
5. the trailer's own GVWR.

Tongue weight: how much should sit on the hitch?

Tongue weight is how much of the trailer's weight presses down on the hitch. Chevrolet's trailering guide recommends:

• 10% to 15% of the loaded trailer weight for a conventional (bumper-pull) trailer, and
• 15% to 25% for a gooseneck or fifth wheel.

Some trailers, especially boat trailers, fall outside those ranges, so follow the trailer's own manual. The same guide suggests putting about 60% of the cargo over the front half of the trailer (when the axles are centred), balanced side to side. A tail-heavy trailer is a common cause of sway.

Here's a worked example with round, made-up numbers: a 3,000 kg loaded travel trailer at 12% puts about 360 kg on the hitch. That's 360 kg of payload gone before anyone gets in the truck.

Don't forget the trailer's own sticker

Trailers have a GVWR label too, usually near the front with the VIN. Subtract the trailer's empty weight to get its carrying capacity, and stay under it. Alberta's guide also notes that the combined rated capacity of the tires on an axle must be more than that axle's GAWR. Use tires designed for highway use, and keep tires on the same axle matched.

"Can't I just add air bags?"

No. According to Alberta's guide, adding components such as air bags or overload springs does not raise any of these ratings, and they still can't be exceeded. Those parts can level a sagging truck, but the axles, brakes, frame and tires are still rated for what the sticker says. The guide also warns that towing too much is a safety risk and may void warranties.

The only way to know: weigh it

Alberta's guide walks through it: weigh the empty truck's front and rear axles to get its net weight, then weigh again loaded and hitched to get your real axle weights and GVW. Compare each number to its rating. Chevrolet's guide gives the same advice: the only way to be sure is to weigh the combination. Many truck stops and some scrap and gravel yards have scales. Call ahead to ask whether they weigh private vehicles.

What about trailer brakes?

Under section 56 of Alberta's Vehicle Equipment Regulation, a trailer pulled by a private passenger vehicle needs its own brakes when it has a maximum gross weight over 910 kg and weighs at least half the towing vehicle's unladen weight. When a trailer's brakes are required, they must apply automatically if the trailer breaks away and stay applied for at least 15 minutes. Whatever the trailer, the whole combination must still be able to stop safely.

Manufacturers often ask for trailer brakes at lower weights than the law does. Chevrolet, for instance, says trailer brakes are required above 2,000 lb (about 900 kg) on some of its trucks and above 1,500 lb (about 680 kg) on its other models. Check your own truck's manual. Towing for work? Commercial vehicles have different rules, so check the regulation.

A five-minute checklist before you buy a trailer

1. Photograph your truck's door sticker (GVWR and both GAWRs).
2. Look up your truck's GCWR and maximum trailer weight for its exact engine, cab, box and axle ratio.
3. Find your hitch's rating, stamped on the receiver and the ball mount. The lowest-rated part sets the limit.
4. Use the trailer's GVWR, not its brochure "dry weight", for your maths, since you'll load it.
5. Estimate tongue weight at 10–15% (bumper pull) or 15–25% (fifth wheel or gooseneck) of the loaded trailer, and subtract it from payload along with people and gear.
6. Once you're set up, weigh everything to confirm.