So your Moho is not useable? A slide out cover is an easy fix why is the dealer dragging it out?
Slide toppers will be a problem in high wind areas. The fix is to put covers on them. Several members have out them on if you do a search you will find the info. I have had no problems with mine in four years. I have not however been out west where the wind can get very strong.
If your dealer is waiting on slide covers for more than a few days they are doing something very wrong. I would bet I could call Andy at FR parts and have one to my place by Wednesday.
Phil and Dianna
2011 Berkshire 390 RB