" suppose you could define Stabilizing as taking SOME of the load off the tires/leaf springs such that movement inside the RV is reduced when someone is walking around or when the wind is blowing (aka: Makes things more stable inside). Whereas Leveling could involve taking ALL the load off the tires/leaf springs with the primary goal of making the RV LEVEL inside (and secondarily making it also more stable since the load will be off the tires/leaf springs). When Leveling in this manner, it is possible that some of the tires could be literally off the ground and the weight on that side/corner will be supported wholly by the leveling jack."
^^^^^^
To get the wheels off the ground with these jacks what do you use as a crank. My cordless impact,lifting my trailer, bottoms out before the wheels even think about lifting off the ground. The hand crank is basically used once there is no weight on the jacks.
I can't imagine one of these would lift a class c off the ground. Stabilize against side by side movement, yes. But if these are not on the frame of the coach you are asking for issues in my opinion.
Think about it. If someone was going to change a tire and put the jack on the corner of your coach to lift it, what would you think would happen.