Tires need to be replaced again on my 2006 30' Class C. I went to a Michelin tire dealer and got quotes for both LTX M/S 2 and XPS RIB. Not sure which way to go given the almost $600 price differen...
Since you said "30-ft" I would say XPS Rib. The LTX MS/2 is a mainstream tire. The XPS Rib is a beefed-up commercial grade tire. In Bridgestone, there's the Duravis line, but the R250 is the only beefed-up one in the group. The rest are good tires, like LTX, like Transforce. XPS Rib and R250 are a cut above. Since 30-ft is going to be right at max weight, I suggest the higher-line tires.