Recreational vehicles manufactured since 1972 have a certification label which provides the following information relating to tires and loads:
  1. Gross Vehicle Weight Rating (GVWR)
  2. Gross Axle Weight Ratings (GAWR) for each axle
  3. Tire and rim sizes
  4. Recommended cold tire inflation pressures


Example of a certification label

The certification label can be found on several different locations within your vehicle, including (but not limited to) the driver's hinge pillar, door latch post, etc. Vehicles manufactured before 1972 may not have a certification label, and the tire and loading information will only be found in the owner's manual.

Your manual also contains information about alternate tire sizes. Be sure to follow all recommendations in your owner's manual regarding the use of these alternative tire sizes. If you are considering changing to a tire size other than those shown on the certification label, be sure to consult with your vehicle manufacturer, tire dealer or tire manufacturer. Using the wrong size tire can lead to tire failure.

Vehicle modifications such as lift kits and other suspension alterations and/or use of tires not recommended by the vehicle or tire manufacturer can adversely affect vehicle handling and stability. Tires specifically designed for travel trailer use in highway service have an "ST" molded on the tire sidewall, such as ST225/75R15. The "ST" stands for "Special Trailer" and means the tire is designed specifically for trailer service.

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