I agree with Bob and other posts with similar sediment. The rear tires need to main rain contact to help keep the coach from drifting on a grade with the parking brake set and transmission in park.
With my SnapPads I definitely have more surface area in the ground than what the tires provide.
The reason the say don’t lift the tires off the ground is all about liability. If the hydraulics fail and the coach starts to drop, they don’t want someone’s foot to be under the tires.
If my front tires are off the ground, I put a block or two of wood under them just in case there would be a problem with the hydraulic.
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