I've had our rig lifted completely off all four wheels for as long as four days with the Levelup and there was no problem or issues. I did not crawl around under the rig while up in the air, was just doing brakes and bearings. The weight capacity of these jacks is over double the weight of these rigs. The landing gear jacks are rated 14,000 lbs each and the leveling jacks are rated 8,000 lbs each, this per the Lippert site.
https://store.lci1.com/shop-by-depar...stems.html?p=4