How do they jack up big coach when replacing tires?

i lift my coach off the tires EVERY time i put it in storage....never had a problem and the coach is not unstable at all...if i needed a tire change on the side of the road, id have NO problem lifting a corner or the entire coach to get it done.

I've been in several campgrounds where one or more tires was off the ground to achieve level, never had an issue, its not like the thing is gonna tip over.