Our 5'er has been sitting in the AZ sun for 18 months and we need new tires before we head home, cross-country, for Maine. Our RV guy in Maine recommended we buy Goodyear Marathons for replacements. But reading elsewhere on-line, it seems that even Goodyear tires are made in China now.....and possibly prone to destructive blow-outs. Has anyone bought Marathons in the last couple of years and, if so, what has been your experience with them? Our local AZ Discount Tire dealer is trying to sell us Carlisle tires; but when we go on-line, there are 3-5 pages of negative comments about problems with these tires. Help!! What do you recommend for very hot, cross-country, driving conditions? Are Marathons good, even though they are made in China now?