Tires on an RV slowly go bad just from sitting still for weeks with the weight of the RV, sun and weather damage. I have had Michelins develop sidewall cracks in 4 years. Wise to keep them covered to protect from sun damage and to drive the rig once a week just to keep the tires rotating and for engine, transmission and brake health. Try to learn all of the cost factors of owning and maintaining a new or used RV before you get into RV'ing. It's like owning an airplane or a cabin cruiser boat. Buying an old used motorhome can be expensive depending on how much DIY you can do and what it needs currently and will need eventually. Be aware of roof leak damage and what it costs to fix. Air Conditioners,Fridges, and Generators are expensive to have repaired or replaced. This forum has a wealth of information but you will need to use the search engine and ask the right questions sifting through brand loyalty opinons, etc.
