I feel your pain brother. I went round and round with Monaco and the dealer about a bedroom slide that was not adjusted properly. The dealer made it worse and Monaco was not much help when I decided to do it myself. They kept telling me to take it back to the dealer. 120 miles and 3 weeks and it comes back worse than before. I finally decided to do it myself. If I recall correctly the bedroom my slide is a Lippert (yours may be different) and there is lots of info on their site which helped me identify how to vertically adjust the slide.
On the Monaco Yahoo Group there are several discussions about Monaco fix which includes a sheet of aluminum attached to the bottom of the slide to the roller to contact instead of the fiberglass bottom thus reducing the wear and tear on the slide.
You might also try to find a local tech that knows what he is doing and ask Monaco to approve him adjusting the slide. I am 120 miles from the bonehead dealer and Monaco approved the local tech to do quite a few repairs.