Protect your parked tires with white RV tire covers from Classic Accessories. Measure your tire diameter to pick the correct size; options are noted for 24"-27", 30"-33", and 32"-34-1/4" ranges, with fits available from small 12-inch trailer tires up to larger 22.5 sizes. A snug, secure fit is the goal when your rig sits through sun, wind, and long storage.
Yes, they're used to protect boat trailer and utility trailer tires when parked in storage. They have held up in hot, humid environments and through storms. You can take them off to wash and recondition with vinyl cleaner. Inspect fit so they're snug; add a strap if your storage area is windy.
Use individual covers for each tire on tandem wheels. Size each cover by the single-tire diameter, like 26.1 inches for ST205/75R14 or about 33 inches for 245/70R19.5. Install each cover snugly; add a rear strap or clips if you're worried about wind since some covers don't have built-in tie-down points.
Measure the tire diameter. For reference, ST205/75R14 is 26.1 inches, ST225/75-15 is 28.287 inches, 235/80R16 is 30.80 inches, 245/70R19.5 is about 33 inches, and 275/80R22.5 is just under 40 inches. Pick the size range that matches your diameter. If your tires are on a trailer and not a spare, size the same way.
They can fit snug with elastic around the edges to help them stay in place. If you expect prevailing winds, add a small nylon strap, bungee, or clips at the back for a more secure fit. Some covers don't include tie-downs or eyelets, so plan a strap if needed. Also check that the cover length doesn't hit the ground on your particular tire size.