[rames14]

I guess I’m old fashioned (or just old), and decided to refer to the manual. Here is what it says:
Slide-Out Tips
Before operating any slide-out:
1. The RV must have a fully charged RV battery (having the shore-line cord plugged in may NOT be enough).
2. Turn off all necessary lights and 12V components prior to extending/retracting.
3. The RV must be leveled and stabilizer jacks extended.
4. Make sure the room has clearance, inside and outside, to extend/retract.
5. Make sure water and debris are removed from the top of the room before retracting
6. Avoid injury by keeping all body parts out of the way of the slide-room.
7. Make sure other parties are clear of the slide-out before extending/retracting.
8. DO NOT ride in the slide-out when extending/retracting.
9. DO NOT step on the floor of the slide-out when the room is retracted. The slide-out floor is not supported by the main floor and stepping on the floor may cause structural damage to the slide room.
I assume, your neighbor in the Motorhome also retracted and made the unit unlevel again before putting slides back in?