UK Fifth Wheel Towing Capacity Calculator

Vehicle GVWR (kg):

Payload Capacity (kg):

Pin Weight (kg):

Trailer GVWR (kg):

Safety Margin (%):

How to Use Your Fifth Wheel Towing Capacity Calculator Safely

Understanding your fifth wheel towing capacity is crucial for safe travels on UK roads. Our calculator helps prevent overloading - a common cause of accidents and mechanical failures. Follow this simple guide to get accurate results.

Step 1: Know Your Vehicle's Limits

Find your vehicle's Gross Vehicle Weight Rating (GVWR) and payload capacity in the owner's manual. These numbers represent your maximum safe operating weights. Never guess - incorrect figures could lead to dangerous situations.

Step 2: Trailer Specifications

Check your trailer's GVWR plate, usually located near the coupling point. This shows the maximum loaded weight your trailer can legally weigh. Remember, UK law requires trailers over 3,500kg to have working brakes on all wheels.

Step 3: Pin Weight Matters

Measure your fifth wheel's pin weight - the actual weight pressing down on your truck's bed. This typically represents 15-25% of total trailer weight. Use a weigh bridge for accuracy if loading heavy cargo.

Step 4: Safety First

We recommend a 10-15% safety margin. This buffer accounts for weight shifts during travel and measurement inaccuracies. Experienced towers can reduce this margin, but never eliminate it completely.

Understanding Results

The calculator shows three key figures:

Available payload after pin weight
Safety-adjusted capacity
Maximum safe towing limit

Red warnings indicate exceeded limits. If you see these, redistribute weight or remove cargo immediately. Remember, UK police conduct random weight checks with on-the-spot fines for overloaded vehicles.

Pro Tips

Re-calculate when changing loads
Check tyre pressure ratings match your weights
Ensure your driving license covers your combined weights (Category B+E for over 3,500kg)

Regularly using this calculator helps maintain safety and vehicle longevity. Bookmark it for easy access before every trip. Safe travels on Britain's roads!