I recently had a blowout and believe it's time to get all new tires for my Bighorn whick weighs in the 12K lb range. The person who changed my tire works for a company that does all the tire work for a local RV Dealer. He told me 10Ply tires is all they have ever put on campers no matter the size or weight of the RV. I have the Transforce 235/85/16 G rated tires right now with some cracking in the sidewalls. He told me E rated tires is plenty sufficient that G rated was overkill. I know the price is a lot cheaper for E rated tires not to mention it's hard to find G rated tires in stock. Any suggestions?