Use these tools to understand the arithmetic behind a vehicle specification. Start with the exact vehicle record or documented input, then inspect the calculation and its limits.
Towing weight worksheet
Add the empty trailer, trailer cargo, water and propane weights. Compare the loaded trailer with a sourced configuration or a rating you enter. The result displays its arithmetic and identifies unavailable payload and vehicle-weight data.
A result below a known rating is not a safety clearance. Axle, hitch and combined-weight limits may remain unchecked. Use the exact documentation for the vehicle and trailer before making a towing decision.
Tire size comparator
Enter the current and proposed tire sizes to compare nominal sidewall height, overall diameter and calculated speedometer difference. The tool explains the dimension calculations so you can see what changed.
Nominal geometry does not check wheel clearance, load requirements or manufacturer approval. Use the comparison as information to discuss with a qualified installer.
Keep the inputs attached to the result
Copying a result without its inputs makes it difficult to interpret later. Keep the full vehicle configuration or tire sizes alongside any calculation, and distinguish numbers you entered from values supplied by a source record.
Need help selecting the correct record? Follow the specification-reading walkthrough, or start with the vehicle finder.