Slides can be problematic but choosing a coach that is well built using a tried and true slide mechanism is important. HWH is a company that makes hydraulic slide mechanisms and they seem to be pretty reliable. I'm on our second coach with the HWH systems, and problems were few. My current rig has 3 HWH slides and one made by Power Gear and they all work fine. Keeping the rubber slide seals clean and coated with talcum powder or maybe dry silicone is about all the routine maintenance they need. IMO, I would avoid a coach with what is called 'full wall slide/s'. They are large and heavy.