Yes, my jacks CAN lift the tires completely off the pavement -- but the manual clearly states to not do that. This Lippert manual has a statement to that effect:
https://cdn2.webdamdb.com/md_FDhPD7lk1c.jpg.pdf
Remember, the rear wheels are where the parking brake is applied, and if you lift them clear of the ground you have no brakes applied at all to resist any lateral movement and you are counting on the structure and integrity of your retractable leveling devices. I for one would never do that...
Chuck