I don't have levelers on my PC but from what I have read here, the HWH levelers PC used were "drive off" so if they got stuck down, you could "push" the coach and the HWH's would fold up (but not retract) so you could still use the coach, albeit without working levelers, until you got them repaired. Surely there'd be a caution in the manual about properly blocking the wheels and/or not raising wheels off the ground.