Looking at Ramble's reply, we used Discount Tire (America's Tire out West) and were very pleased with their price and service. I don't think I've heard complaints about Discount/America's, and I'm pretty sure same about Schwab. BTW, sounds like Ramble might have R250's.
I don't keep a tally sheet, but the above seems to be true. Also true that many places don't want to work on something that won't fit In the Door, Onto the Lift, Under the Roof, etc. First set I had installed on another RV, took it to Pep Boys. Back when they had Futura Scrambler 8.75R16.5D... One man did it outside, took 02 hours, but they didn't balk at the job, not one minute.
Big trucks, tractor/trailers, run Steer, Drive, and Trailer tires. I have heard claims that Rib tires (like Duravis R250 and Michelin XPS) track a little better than All Season, Mud/Snow, Off Road... The old Scramblers were All Season and the new R250's are very Rib. I can't say I've seen Bad/Good from those two, one vs. the other.
Most of us do NOT rotate their RV tires. Some rotate front with spare and that's what I happen to do. If you wanted All Season on the Rear for a little better traction, and Rib on the front, I'd say go ahead. Make the Spare a Rib, rotate those three, and get the Spare off the rear (for a new All Season) if you have a rear tire failure.
I'm sure I'll replace all seven on AGE and not Wear. Probably not on Failure either. Only RV tire failure I've had was a tire of unverified age that had had stood around a lot not being driven. The Scramblers were low-priced tires and zero problems for 08 years. Same for the R250's. Not much reason to rotate RV tires since most of us'll age them out before we wear them out. I just rotate Spare to get some use out of it before it ages out.