I have "heard" that a RV must ALWAYS be level when parked. Ours is NOT - it is slightly OFF but it is just parked. We do not have the fridge running. Will this affect the fridge? We cannot park it anywhere else right now and our driveway has a slight uphill slant. Also, husband does NOT like to keep the hydraulic levelers down for long periods of time as he says they will get "stuck". Is this possible??