You might be told by some tire dealers that the Michelin size on your RV doesn't have a cross. That's not strictly true.
Tire Size CalculatorI owned a 19.5" tired RV for years...I like Toyo & Bridgestone. But I've also gotten good life and miles out of Double Coin, and I'm now trying a set of 22.5" RoadLux steer tires from Amazon (Free shipping with prime...saving $80 to $100 PER TIRE shipping costs when bought online). My tires mileage out rather than age out though I do have some Michelin drive tires that are 7 years old and have lots of side wall cracking. Just bought this used Journey last February and it has 22.5" tires. I'm not a big Michelin fan either.
That tires size calculator is really handy when checking different sizes.