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The real issue in my opinion is that these light-duty jacks are not strong enough to handle lateral forces at ground when parked on incline, particularly since they would be near full extension. When designed for it, much larger vehicles like mobile cranes and power-company trucks are jacked off the ground safely.
Even if all wheels were jacked off ground, why would pads slide? There is plenty of friction between steel and concrete or pavement to keep motorhome from “sliding” down the driveway. The coefficient of friction may be a little lower than a rubber tire, but we’re only talking about a slope of few percent.
There is nothing inherently wrong with jacking wheels off ground if jacks are designed for it, but in this case they are not. Owner is taking a risk that a jack may bend, collapse, or damage attachment point at frame.
In my opinion it pays to not commingle issues. Just because jacks are not designed for it in this case, it doesn’t mean the act of jacking tires off the ground in itself is inherently unsafe because of some other imagined issue.
If instructions say not to jack off ground, best not to do it; regardless of whether we know the correct reason or not.
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