Slides can be a major PITA, unquestionably. I had four huge ones on my last DP, had a few alignment problems with them when the coach was new, then many years of no problems. Our current Gemini, has two, in comparison, tiny slides, critical IMO to providing enough space inside a very small motorhome, to survive. So far no problems with either of these slides. As wary as I am of potential problems with slides, I would not want to not have them. I do think, however, that the full wall slides are probably more problem prone than the smaller ones.
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