All the motorhome owners that I know either have hydraulic levelers or they uae boards under front wheels for fore/aft leveling and also under the side tires for left/right leveling.
Although the pictured jacks may advertise and even be able to support the weights you posted, you would not be abe to turn the crank hard enough to lift the weight of tha motorhome.
I have never seen a motorhome use the stabilizers you have pictured. They are very common on trailers however for stabilazition only - not leveling. Trailer owners use some type of support to drive up on to level - boards or other devives made for that purpose. Then they crank down the stabilizers to keep the trailer from bouncing around too much. There sre some electric and hydraulic leveling systems made that can be used on trailers . I guess it would not hurt to try them and see what happens , but only for stabilization. If you do it, please report back here how it went.
Keep in mind that it is a vehicle with tires and springs and , unless you support it completely off the ground, there will be some type of movement when someonr walks around in it,
Barney
