Car Hauler Tongue Weight & Vehicle Placement Guide
Pre-configured for a typical 18–20 ft tandem axle open car hauler carrying a 3,500 lb vehicle (~7,000 lbs total GTW). Where you strap down the car determines whether your combination is safe or unstable.
Most vehicles carry 60% of their weight over the front engine axle. If you back a car onto a flatbed trailer, the heavy engine sits at the extreme rear of the trailer deck. This creates negative tongue weight, lifting the back of the tow vehicle and causing violent, unstoppable trailer sway at highway speeds. Always drive vehicles onto trailers nose-first.
SAE J2807 standard: Tongue weight must equal 10% to 15% of Gross Trailer Weight to stabilize highway tracking.
1. The 60/40 Rule for Flatbed Car Haulers
Under Department of Transportation (DOT) cargo loading rules:
- 60% of Total Cargo Weight: Must be positioned in the front half of the trailer deck (forward of the trailer axles).
- 40% of Total Cargo Weight: Sits over or behind the trailer axles.
- The Target Tongue Range: Aim for 10% to 12% tongue weight (e.g., 700 to 840 lbs on a 7,000 lb rig).
2. Step-by-Step Vehicle Placement Protocol
- Position the Engine Forward: Drive the car on nose-first unless transporting a rear-engine Porsche or mid-engine sports car.
- Center the Mass: Drive forward until the vehicle's engine block is slightly forward of the front trailer axle.
- Measure Truck Squat: Measure the height of your truck’s rear bumper before loading. When properly loaded, the rear suspension should settle 1.5 to 2.5 inches, but the front wheel well must not rise more than 1/2 inch.
Weigh Your Vehicle Tongue in the Driveway
Verify your exact placement before hitting the highway using our 2x4 Bathroom Scale Lever Tool, check WD Hitch Requirements, or view the Complete Percentage Matrix.