How to Read a Towing Sticker: The Complete Door-Pillar Decoding Guide

Open the driver-side door and read the sticker before you shop for a trailer. The five numbers that matter first are payload, GVWR, front GAWR, rear GAWR, and cold tire pressure / tire size. Payload tells you how much weight the truck can carry. GVWR caps the loaded truck. GAWR caps each axle. Tire pressure and tire size confirm the load-rating setup the manufacturer certified. Use this order: 1. Find the payload line: "combined weight of occupants and cargo should never exceed..." 2. Subtract passengers, bed cargo, hitch weight, and trailer tongue weight. 3. Compare loaded truck weight with GVWR. 4. Compare front and rear axle scale weights with GAWR. 5. Confirm the tire size and cold pressure match the sticker. Then run the numbers in the Payload Calculator, compare combined weight in the GCWR Calculator, or use Can I Tow This? for a full truck-and-trailer check.

How to Read a Towing Sticker: Most truck and SUV owners glance at the door sticker once when buying the vehicle and never look at it again. This is a critical mistake. The Tire and Loading Information label — the yellow-and-white sticker affixed to the B-pillar of your driver-side door frame — is the single most authoritative document governing your vehicle's safe towing and loading limits. It supersedes every brochure, every dealer claim, and every advertisement. Unlike the towing capacity numbers printed in marketing materials (which reflect an ideal, stripped-down vehicle under perfect conditions), the door sticker represents your specific vehicle as configured from the factory, accounting for every option, package, and drivetrain choice selected at build time. Two trucks that look identical sitting side by side on a dealer lot can have door stickers with dramatically different payload numbers, simply because one has a heavier cab package, a sunroof, or different axle gear ratios. Federal tire and load-labeling rules, including 49 CFR 571.110, require consumer loading information labels on passenger vehicles sold in the United States. The numbers are not brochure estimates; they are the best starting point for the vehicle's loading limits. Exceeding them can affect handling, braking, warranty evaluation, insurance review, and liability analysis after a crash. Before you hitch any trailer, before you load any cargo, before you plan any route, open that door and read the sticker. Understanding it takes about ten minutes. The knowledge it gives you lasts a lifetime of safe towing. Use our Payload Calculator to put those sticker numbers to work instantly.

A standard U.S. vehicle door sticker contains several distinct data blocks. Here is exactly what each one means: Block 1 — Vehicle Identification & Tire Information At the top of the sticker, you will find the vehicle's original tire size (e.g., LT275/70R18) and the cold tire inflation pressures for the front and rear axles. These pressures are the factory-optimized settings for your specific load ratings — not the maximum tire sidewall pressure. Running tires at the wrong pressure while towing is a leading cause of blowouts and handling instability. Block 2 — The Critical Payload Line This is the most important single number on the sticker. It reads exactly as: "The combined weight of occupants and cargo should never exceed XXX lbs." This is your Payload Capacity — calculated by the manufacturer as GVWR minus the actual curb weight of your specific vehicle. This number already accounts for your engine, transmission, option packages, and accessories installed at the factory. Aftermarket additions like heavy steel bumpers, bed liners, toolboxes, and winches reduce this number further because they add to the vehicle's real-world curb weight. Block 3 — GVWR (Gross Vehicle Weight Rating) Listed below the tire data, the GVWR is the maximum allowable total weight of the vehicle itself when completely loaded: driver, passengers, cargo in the cab, cargo in the bed, fuel, and the downward tongue weight of any hitched trailer. It is the manufacturer rating for the vehicle's loaded weight. Exceeding GVWR may violate applicable rules, reduce handling and braking margin, and create warranty or liability issues after an incident. Verify how your load stacks up against this limit using the GCWR & Towing Calculator. Block 4 — GAWR Front and GAWR Rear These two figures represent the maximum structural load capacity of each individual axle assembly. Bumper-pull towing transfers enormous downward force to the rear axle — often causing the Rear GAWR to be exceeded even when the overall GVWR is still within limits. This is the most commonly missed overload scenario in recreational towing. The front GAWR limits how much load can be transferred back to the steering axle via a weight distribution hitch. Block 5 — Rim Size and Load Index This block confirms the approved wheel rim diameter and width for the factory tire package. Installing wider or larger-diameter aftermarket wheels changes the load index, rolling diameter, and tire contact patch, all of which affect the accuracy of your speedometer and odometer as well as the handling dynamics under a heavy trailer.

The tire code stamped on your door sticker (and on the tire sidewall) carries an enormous amount of structural data that directly affects your towing safety: LT — Light Truck construction. LT-rated tires have a stiffer internal sidewall structure and higher load ratings than standard passenger (P-metric) tires. Always use LT-rated tires when towing heavy loads. P-metric tires are under-rated for sustained towing and can overheat and fail under trailer tongue weight loads. 275 — Section width in millimeters. This is the width of the tire from sidewall to sidewall. Wider tires distribute load over a broader contact patch but also increase aerodynamic drag when towing. 70 — Aspect ratio. This is the tire's sidewall height expressed as a percentage of the section width. A 70-aspect tire has a sidewall height of 70% × 275mm = 192.5mm. Taller sidewalls provide more cushioning but also flex more under heavy vertical load, which can affect trailer tracking stability. R — Radial construction. All modern towing tires are radial. The radial ply arrangement provides superior heat dissipation and load distribution compared to obsolete bias-ply designs. 18 — Wheel diameter in inches. This determines which rim sizes are compatible with the tire. Beyond the size code, look for two additional critical ratings on the tire sidewall itself: Load Index: A numerical code (e.g., 116) indicating the maximum weight the tire can support at its rated inflation pressure. For a tire rated 116E, the E denotes the load range, which determines the maximum inflation pressure and structural ply rating. Never inflate tires above the door sticker recommendation simply to increase load capacity — the vehicle's suspension and axle ratings are the true limiting factor. Speed Rating: A letter code (e.g., S = 112 mph) indicating the maximum sustained speed at which the tire can carry its rated load. Many tires have lower speed ratings when towing in extreme heat. Check your tire's speed rating against your intended highway cruising speed.

Many drivers confuse GVWR and GCWR, treating them as the same limit. They are not. They govern entirely different aspects of your towing system, and exceeding either one creates distinct mechanical failure modes. GVWR (Gross Vehicle Weight Rating) This number governs the tow vehicle in isolation. It is the maximum certified weight of the truck or SUV itself when loaded with everything it is carrying: fuel, driver, passengers, bed cargo, and the tongue weight of any attached trailer. The structural components sized to this limit include the frame rails, spring rates, shock absorber valves, wheel bearing load ratings, brake caliper clamping forces, and axle housing bending strength. GCWR (Gross Combined Weight Rating) This number governs the total mass of the integrated tow system: the loaded tow vehicle plus the fully loaded trailer. It reflects the limits of the drivetrain and cooling system — specifically, the engine's sustained power output, the transmission's clutch thermal capacity, the cooling loop's heat rejection at full load, and the differential gear ratio's torque multiplication capability. You can explore your specific truck's GCWR in our Truck Specs Database. The Practical Difference A truck with a GVWR of 7,000 lbs and a GCWR of 14,000 lbs means the truck alone cannot weigh more than 7,000 lbs, and the combined weight of truck plus trailer cannot exceed 14,000 lbs. Therefore, the maximum trailer weight is GCWR minus your actual loaded truck weight — not GCWR minus GVWR. If your truck weighs 6,400 lbs when loaded (including passengers and tongue weight), your maximum trailer weight is: This is frequently 1,000 to 2,000 lbs less than the advertised maximum towing capacity, because that advertised number assumes a lightly loaded truck at ideal conditions.

GVWR (Gross Vehicle Weight Rating): The maximum certified structural weight of the tow vehicle alone when fully loaded. Set by the manufacturer and enforced by NHTSA. This is the hardest limit on the sticker. GCWR (Gross Combined Weight Rating): The maximum allowed weight of both the tow vehicle and the attached trailer together. Found in the owner's manual rather than on the door sticker, but directly related to the sticker figures. GAWR-FR (Gross Axle Weight Rating — Front): The maximum load the front axle assembly can safely support. Includes wheel bearings, spindles, brake rotors, calipers, ball joints, and steering components. GAWR-RR (Gross Axle Weight Rating — Rear): The maximum load the rear axle assembly can safely support. This is almost always the first limit exceeded in bumper-pull trailer towing because tongue weight concentrates mass at the rear. Payload Capacity: Derived by the manufacturer as GVWR minus the factory-built curb weight. This is the total weight budget available for passengers, cargo, and trailer tongue weight combined. Cold Tire Inflation Pressure: The recommended tire pressure when the tire has been stationary for at least three hours (truly cold). Towing at the correct cold inflation pressure is critical for safe load distribution and heat management. Load Range: A letter designation (C, D, E, F) that indicates the maximum ply rating and inflation pressure of the tire. Load Range E tires, rated at 80 PSI maximum, are the most common for half-ton and three-quarter-ton truck towing applications. VIN (Vehicle Identification Number): The 17-character code identifying your specific vehicle. The VIN decodes your exact factory specifications, including axle ratio, engine option, and towing package, all of which affect your real-world capacity.

Armed with your door sticker data, here is the precise step-by-step process to calculate your actual available payload before hitching any trailer: Step 1: Read the payload number from the door sticker. Example: "The combined weight of occupants and cargo should never exceed 1,480 lbs." Step 2: Subtract all human weight in the vehicle. Driver (200 lbs) + Spouse (150 lbs) + Two Children (120 lbs) = 470 lbs Remaining payload: 1,480 - 470 = 1,010 lbs Step 3: Subtract all cargo loaded into the cab and bed. Luggage in rear cargo area (100 lbs) + Generator in bed (85 lbs) + Tools and camping gear (75 lbs) = 260 lbs Remaining payload: 1,010 - 260 = 750 lbs Step 4: Subtract the weight of your hitch assembly. Weight Distribution Hitch and ball mount (90 lbs) = 90 lbs Remaining payload: 750 - 90 = 660 lbs Step 5: Your remaining payload estimates your tongue-weight budget. You have about 660 lbs available before checking axle weights, tire ratings, hitch rating, and the final loaded scale ticket. Step 6: Estimate trailer weight from tongue weight. At a 12% tongue weight ratio (the ideal midpoint of the 10–15% safe window): This step-by-step process matters because it may reveal a practical trailer-weight target much lower than the vehicle's advertised towing capacity. Run this calculation using the interactive Payload Calculator before making any trailer purchase.

Mistake 1: Using the Brochure Towing Capacity Instead of the Door Sticker The maximum towing capacity printed in sales materials assumes the truck is carrying only a single 150-lb driver, with no cargo in the bed, no passengers, and factory-stock accessories. Every real-world towing scenario reduces this number. The door sticker payload is the only accurate starting point. Mistake 2: Ignoring Aftermarket Modifications Every pound added to the vehicle after it leaves the factory — a heavy steel bumper, a winch, an aftermarket toolbox, a sliding fifth-wheel hitch, a heavy bed liner, roof rack — reduces your available payload. These items are not accounted for in the door sticker payload figure because they were not installed at the factory. You must manually subtract them. Mistake 3: Confusing Dry Trailer Weight with Loaded Trailer Weight Trailer manufacturers publish "dry weight" or "UVW" (Unit Vehicle Weight) — the trailer's weight as it leaves the factory with no water, no propane, no gear, no food, and no passengers. A travel trailer with a 5,000-lb dry weight can easily reach 7,500 lbs when fully loaded for a two-week family camping trip. Always calculate tongue weight based on loaded trailer weight, not dry weight. Use our Tongue Weight Guide to learn all measurement methods. Mistake 4: Not Re-Reading the Sticker When Adding Towing Options If you add a factory towing package or upgraded suspension after purchase, the door sticker does not automatically update. You must contact the manufacturer to obtain updated ratings, or use a certified scale to verify actual axle weights. Mistake 5: Relying on the Previous Owner's Knowledge On used vehicles, do not rely only on what the previous owner said the truck could tow. Start fresh with the door sticker and owner's manual, then verify the actual curb weight using a public scale or CAT scale at a truck stop.

Steve M. was shopping for a travel trailer after purchasing a new half-ton pickup advertised as capable of towing "up to 11,200 lbs." He found a beautiful 30-foot fifth-wheel trailer at a dealer, listed at 9,800 lbs dry weight. On paper, the math seemed fine — 9,800 lbs is well under 11,200 lbs. Before signing the purchase contract, Steve opened his truck's driver-side door and read the sticker carefully for the first time. The sticker read: "The combined weight of occupants and cargo should never exceed 1,340 lbs." Steve did the calculation: * His own weight: 220 lbs * His wife's weight: 150 lbs * Standard cargo (tools, gear): 180 lbs * Fifth-wheel hitch (king pin plate, rails, head): 250 lbs * Total before tongue weight: 800 lbs * Remaining payload for pin weight: 540 lbs A fifth-wheel trailer's pin weight runs at 15–25% of loaded weight. The 9,800-lb dry trailer, once loaded with water (50 gallons = 417 lbs), propane (40 lbs), food and gear (300 lbs), would weigh approximately 10,557 lbs loaded. At a conservative 18% pin weight ratio, the king pin would press 1,900 lbs down into the truck bed — more than three times Steve's remaining payload capacity of 540 lbs. Steve walked away from that trailer and instead purchased a lighter 24-foot bumper-pull unit that kept his total tongue weight within the 540-lb planning window. The door sticker reading helped him avoid a setup that likely exceeded payload and rear-axle limits. The lesson is clear: the door sticker is not a bureaucratic formality. It is the best starting point for your vehicle's real loading limits.