Do not confuse size with strength.
My RV Travel trailer weighs in just under 8,000lbs “empty” meaning no food, clothes, gear, or water/sewage.
It’s tires size is 205/75R/15….but they are Special Trailer (ST) tires with a load rating of D which means each tire can hold 2,755 lbs of trailer weight per tire and there are 4 tires making the tires able to hold just over 11,000 lbs of load
These tires have several layers of steel belts layered within the rubber tire and have a max PSI of 60lbs.
Car tires are typically larger accommodate the fact that they are the controlling tires for the vehicle and a wider tire means more contact area to use and a larger diameter tires offer a more stable ride. Plus a larger diameter tire tends to have a bigger side wall which absorbs shocks better which smoothes out the ride more.
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