When we got our new TT back in 2005, First one with a slide, I was retracting the slide, maybe 3rd or 4th time, I heard a crunch, Seems I left a stool in front of the slide where it squeezes in real tight, I damaged the wall access door the stool crushed up against. Pilgrim, sent me a new access door, never done that again, To this day, even with our new MH with 3 slides, I check and double check the slide paths before retracting them.