I have never thought that having a tire suspended was hard on the tire(s) that were suspended... I would never want to have the rear tires suspended since the rear tires are the source of the emergency breaking to prevent any motion. Even though jacks are down I would not want to subject the jacks to lateral stress by having the rear wheels off the ground where any slope was involved.
The only concern I have ever pondered was the stress on the suspension components of prolonged absence of ground contact.
I do think that if there is a circumstance where a tire is bearing weight for an extended period of time with only partial tread contact that could be damaging so I just avoid that scenario.
Having tires off the ground is less likely on a diesel pusher since part of the leveling process is to deflate the air suspension so the house starts out much lower than a non air suspension motorhome.
I can not conjure up the logic that would prescribe damage to a tire that is suspended and not weight bearing...
JohnnyT