i keep my tires above water and apply aerospace 303 protectant on them a few times a year but i dont worry about what surface my Moho tires are on any more than i worry about what my other vehicles' tires are parked on
some things i worry about, others i dont
IMHO the only logical surface to even consider putting between tires and another surface would be a mat made out of the same rubber your tires are, otherwise my guess is SOMETHING in that barrier you choose will likely react with the tires SOMEHOW SOMEWAY
'08 Newmar Kountry Star 3916, 400ISL Cummins
'05 Cedar Creek Silverback 33lbhts
'11 Jeep Wrangler Unlimited Sahara
'07.5 LMM 2500HD Duramax Crew 8'
Blue Ox, BB, PP TPMS, BB Buggy, Ranger EV
Why not just put new tires on every year and not have the worries?
You are kidding, right? New tires every year? Aren't things expensive enough.
As for the subject, I park my rig at home on gravel with pieces of rubber mud flaps underneath. Last tires lasted 7 years without incidents. On the road I don't use anything-too many other items on the list.