2014 Sundance XLT 285ts. Doorside slide out is very large. When retracted (in) during travel, the inside edge of the slide floor appears to be sagging down so that it rubs on the coach floor. This is making a wear spot on the floor and I expect soon will have the finish rubbed off and eventually a hole in the floor covering (linoleum). Not sure even adjustment can correct this as there is so much sag in the slide floor. Not that much room to raise the slide. Is this a common problem?