Setup decision calculator
Can I Tow This?
Check a real truck, SUV, camper, boat, utility trailer, or RV setup against tow rating, payload, GCWR, tongue weight, and 80% planning margin. Use loaded weights, not brochure dry weights, whenever possible.
Vehicle and trailer inputs
The truck
Sets the three limitsDoor sticker, owner’s manual or a scale ticket.
The trailer
Counts in all three checksUse scale weight or dry weight plus water, propane, batteries, and gear.
813 lb on the hitch
10–15% bumper-pull; 15–25% fifth wheel or gooseneck.
In the tow vehicle
Counts against payload and GCWRVerdict
Pre-tow check
3 of 3 checked
01Payload
38 lb left1,663 of 1,700 lb98%
02GCWR
4,450 lb left12,550 of 17,000 lb74%
03Tow rating
3,500 lb left6,500 of 10,000 lb65%
Technically within limits, but close
Binding limitPayload
38lb left
Limit check
- Tongue or pin weight
- 813 lb
- Payload used
- 1,663 lb
- Remaining payload
- 38 lb
- Combined rig weight
- 12,550 lb
- Remaining GCWR
- 4,450 lb
- Remaining tow rating
- 3,500 lb
- 80% tow target
- 8,000 lb
Payload first
Tongue weight, passengers, cargo, and hitch equipment all consume payload. This is where many camper setups fail.
GCWR second
GCWR checks the whole loaded rig. More people and cargo reduce available trailer weight.
Tow rating last
The advertised rating matters, but it assumes a specific configuration and does not replace payload or GCWR checks.
How this towing check works
This tool answers one question — can this vehicle tow this trailer — by testing the setup against four limits in turn and reporting whichever runs out first. That order matters: a setup that passes the tow rating can still fail on payload, and the failure that matters is the first one, not the average.
- Payload remaining
- door-label payload − passengers − cargo − hitch hardware − tongue weight
- Trailer weight allowed by GCWR
- GCWR − (curb weight + passengers + cargo + hitch)
- Tongue weight estimate
- loaded trailer weight × 0.10 to 0.15 (bumper-pull)
- 80% planning margin
- binding limit × 0.80
Tow rating: can it pull it?
The published maximum trailer weight for your exact engine, axle ratio, cab, bed, and drivetrain. It is the check people run first and the one that fails least often on modern trucks.
Payload: can it carry the tongue?
Tongue weight lands on the tow vehicle alongside every passenger, every bag, and the hitch itself. On family setups this is usually the limit that binds, and it comes from the label in your door jamb rather than a brochure.
GCWR: is the whole rig legal?
GCWR caps the loaded vehicle and loaded trailer together. Subtract your actual loaded vehicle weight from GCWR and compare what is left with the loaded trailer. A heavy crew cab can consume this margin before the trailer is coupled.
Hitch, axle, and tires
The receiver label carries its own maximum trailer weight and tongue weight. The certification label carries a separate GAWR for each axle. The tire sidewall carries a load rating. Any of the three can be lower than the vehicle's tow rating.
Why the tool reports a margin, not a yes
A pass with 20 lb to spare and a pass with 900 lb to spare are different situations. Seeing the margin on each limit tells you how much room you have for the gear you have not packed yet.
The 80% convention
Many experienced towers plan to about 80% of the binding limit. It is a convention rather than a rule, and it exists because grades, altitude, heat, crosswinds, and imperfect loading all consume margin that a calculation does not show.
Worked example: half-ton and a 7,000 lb travel trailer
A crew-cab half-ton: 11,300 lb tow rating, 15,000 lb GCWR, 1,684 lb payload on the door label, 5,400 lb curb weight. Two adults, two children, 200 lb of gear, a 90 lb weight-distribution hitch, and a 7,000 lb loaded trailer at 13% tongue weight.
Two of the four checks pass comfortably and the setup still fails, because payload is over by 116 lb. Leaving 120 lb of gear at home, or moving it into the trailer, brings it inside — and that is a decision you can only make if you know which limit is binding.
| Line item | Weight | Where the number comes from |
|---|---|---|
| Trailer vs tow rating | 7,000 / 11,300 lb | 62% used — passes with 4,300 lb spare |
| Tongue weight | 910 lb | 7,000 × 0.13 |
| Payload used | 1,800 lb | 910 tongue + 600 people + 200 gear + 90 hitch |
| Payload available | 1,684 lb | From the door label |
| Payload margin | −116 lb | Fails: over by 116 lb |
| Loaded vehicle weight | 6,290 lb | Curb + people + gear + hitch |
| GCWR margin | 1,710 lb | 15,000 − 6,290 − 7,000 — passes |
When this result can mislead you
- The payload figure you enter must come from your own door label, not a brochure or a forum post — options can move it by several hundred pounds.
- Accessories added after purchase (bed cover, bumper, winch, roof rack) are not in the door label and have to be subtracted by hand.
- Tongue weight estimated at a percentage can be 200 lb out on a front-kitchen floor plan. A scale ticket replaces the estimate.
- Trailer dry weight understates almost every real trip. Use loaded weight, or the trailer's GVWR if you have not weighed it.
- Passing GVWR does not mean each axle passes — the rear GAWR often runs out first under tongue weight.
- The result is a planning estimate. Brakes, tires, hitch condition, and driver experience all matter and none of them are numbers this tool can see.
Frequently asked questions
How much can my truck tow?
Less than the brochure figure, in almost every case. Start with the tow rating for your exact configuration, then subtract what your passengers, cargo, and tongue weight take out of payload and GCWR. The lowest remaining margin is your real answer.
Why does this tool say no when my trailer is under the tow rating?
Because the tow rating is only one of four limits. Payload is the most common failure: a trailer well inside the tow rating can put more tongue weight on the vehicle than its door label allows.
Where do I find the numbers this tool asks for?
Payload and GVWR are on the tire and loading label and certification label in the driver's door jamb. GCWR and the tow rating are in the owner's manual or the manufacturer's towing guide for your configuration. Trailer GVWR is on the trailer data plate.
Should I use trailer dry weight or loaded weight?
Loaded weight. Travel trailers typically gain 1,000-1,800 lb between the brochure and the road once water, propane, batteries, and gear are aboard.
What is the 80% towing rule?
A planning convention that keeps loads at roughly 80% of the binding limit, leaving margin for grades, heat, wind, and loading changes. It is not a legal requirement.
Does a weight-distribution hitch change the answer?
It redistributes tongue weight across the axles and restores steering and braking balance, but tongue weight still counts in full against payload. Some manufacturers publish a higher tow rating when one is fitted — check your towing guide.