Mike welcome to the Jayco forums.
I have never used one myself, but I see where they may work ok on a PUP (pop-up). My concern once you get into the HTT's TT's, etc., that the tubular frame may have a tendency to settle into the ground thus placing unwanted weight on the corner stabalizers. IMO a couple of wood boards (easy to store) will provide a better foundation for the tires for leveling needs.
2016 GM 2500HD 6.0L/4.10
2005 Jayco Eagle 278FBS
Reese HP Dual Cam
Putnam Class V