Just a note on tire pressure; The load rating is based on Max pressure. Most RV manufactures use tires that just meet the requirements for max load if inflated to max pressure. I have seen some cases where the valve stems used are not rated for the max pressure of the tire. Many of the tires have a speed rating that is less than the speed limit on most Highways. Heat is an issue in many of the southern states, and a tire that is out of balance will generate more heat than a balanced tire. A tire can be perfectly balanced and if it is out of round, it will react much the same as a tire that is out of balance.