Tires off ground question

AikenRacer wrote:
Just read an article in the new Motorhome magazine page 64 and it says "If any of the tread is unsupported, it can cause internal damage that may not be obvious at the time." At my job I see huge cranes all the time, set up for days, with all their tires off the ground.

I think taking the sentence out of context in the paragraph, a lot is getting left to the imagination. I have to reserve judgement til after I read the article. I am thinking that he meant to say, if any of the thread is supported and some of it is not, there can be internal damage to the tire. Don't think the author is saying that there can be damage if the whole tire thread is unsupported, but only if part is supported and part isn't supported. The whole footprint of the tire has to be in contact with the block or support.