Tire/Wheel Covers.

[ToddJK]

Another idea, buy the cheap tarps, cut them in half, use a little tape to stop the fray and put a bungee or two on each tire to keep it there. I forgot, but my grandparents did that with their rv when it was not in use.

 

[serpico760]

I just bought one of those for $20 and put it on my tire, fits great. Buying 6 more.
LBTING Fire Pit Cover, 48 inch Cover for 42-48 inch Round Firepit, Waterproof Windproof Dustproof UV-Resistant Heavy Duty Cover for Outdoor Patio Firepit Table - Black https://a.co/d/inQ6DbA

I just bought more of those. The fit great even if they don't last more than a couple of years they're only $20 each so who cares!

 

[hvydee]

Yeah, I had to replace perfectly good tires due to cracking from UV rays. The bbq cover looks promising…