Hi Jim, great question. When you say on an incline, if you mean the front two tires are uphill or downhill from the back tires - no problem. If the left or right side of the coach are raised equally, again no problem. Where you might have a problem is when one tire is higher or lower than the rest as this torques your RV chassis. and can cause future issues with your slide-outs if left that way too long.
Appliances work best when the rig is level, but you said Parked and turned off, so I'd guess that isn't an issue either.