If you bought a new Class C on a Ford chassis, it'd come with Michelin LTX M/S2 tires. Michelin is a name that needs no introduction, no apology, anywhere in the world. The LTX M/S2 meets all requirements and has that reputation for quality.
The XPS RIB is a downsized commercial tire. So is Bridgestone's Duravis R250. Same load rating but the tire is considered "tougher." Our Class C had R250's from the previous owner. They were bulletproof, so when we needed to replace, we simply went with another set. Discount (aka America's) Tire.
Does your friend care that LTX has an "all season" tread and XPS has a "highway" tread? I've heard it claimed that a "Rib" or "Highway" tread is similar to "Steer Axle" tread for heavy duty trucks. They use "Steer, "Drive," and "Trailer" versions of their big tires, like the 22.5" and 24.5" rim sizes. Anyway, some believe that Rib will track better on the road than All Season. We had All Season on or first Class C and it tracked fine.