Best surface for tires to sit on for extended periods?

I like concrete. Because that is what mine are on. Doubt it matters much.

PLastic. No effect on tires, no moisture retention,

Popsie wrote:
Don't let them sit on anything - jack them off the ground and use good tire covers.

Good tire covers I agree with. Jacking them off the ground, who does that anymore? Too much work and if I want to go I don't need the extra work. My rig sits on gravel with old rubber mud flaps between the tires and gravel. My last set of tires were 7 years old when replaced, without any problems.

Don't let them sit on anything - jack them off the ground and use good tire covers.

Interesting. So it seems that, as most topics end up, its a battle of opinions. I could see where asphalt would potentially do harm do to the petroleum base. Currently my tires sit on wood as I didnt like them sitting on gravel and rocks. But I was thinking of taking some rubber barn mats and cutting them to park on. I guess I'm fine as I have them now. :)

Should not make any difference what surface their on if the RV is just setting for long periods. They won't have that much treadware and the rule of thumb is to replace them after five years.

One that does not let moisture get to your tires

This post on irv2 may be the answer.