: Common for medium utility and cargo trailers.

: Standard for large travel trailers and heavy equipment haulers. 3. Measure for the Right Rims

If buying new rims, you must match the existing hub's and diameter . How To Choose the Best Tires for Your Trailer - Les Schwab

: Higher capacity for larger utility or boat trailers.

Your tires must support your trailer’s , which is the total weight of the trailer plus all cargo and fluids.