How do they jack up big coach when replacing tires?

My owners manual clearly says don't use the leveling jacks for changing tires. So when I had my new tires installed I used the leveling jacks! :) The tire place didn't have a bay big enough for a motorhome so we changed the tires in the lot. I did make the technician get jackstands to put under just in case as I didn't want any damage in case the leveling jacks failed for some reason.