cheeze1 - Hi "cheeze1". The size of tires on my unit are LT225/75R-16. They were load range C, but I had load range E installed last fall. Put on Firestone Transforce HT for $155 each for 6 including tax, recycling fee, mounting, and balancing. The old Generals were still in great shape, but I was concerned about the age - going on 10 years. I had no weather checking on the sidewalls, but my RV is stored indoors except when on the road.
I only had about 40,000 miles on them - could have easily gone another 20,000. I think I got a better price on my new ones as the "tire store" saw potential in re-selling the old ones for $20 each or so. This "tire store" is in a former gas station for the last 50 years. His father ran the place, now it is the son helped by grandson. If you are ever out this way, I would be happy to introduce you to Joe.