I have no doubt that Stabile Lift does what it's designed to do if you don't hate the look. But, I can't see how it would work at different heights for each jack either. Better to lower the conventional jacks on blocks or stall mat squares.
I'm not saying it is typical, but sometimes the ground isn't very level even at campgrounds. In Yellowstone's Bridge Bay campground in one space, I had a different number of blocks under each tire to level the camper. I'm not sure how that would work with Stabile Lift, but it seems like it would either be unlevel or put a lot of twist in the system.
As far as fear of collapsing goes, anything can break.