We have a 2001 Diplomat 38 PBD with the kitchen/sofa in the slide. It has 5 rollers that it rolls on, 3 mounted to the floor that the bottom of the slide rolls on, and 2 mounted to the bottom of the slide that roll on the floor. The tiles in the kitchen rear were cracked and under broken, the floor mounted roller under the kitchen wasn't touching the bottom of the slide therefore not carrying any weight. After adjusting the rear most roller so that all rollers were carrying weight feel that was the reason for the broken tiles. One roller was carrying most of the weight. It dropped the rear of the slide about 1/2" I think this had come from the factory that way. Something to check anyway. Don