I am curious if the slide needs occasional adjustment and if so is there any literature available or how to videos? Also, is it unusual for it to be slightly un-level with almost a sag when fully extended? I put a bubble on the outer wall of the TT and the Slide out and there is a difference? It opens and closes fine best I can tell. It does seem to snug up top or bottom depending if it's being opened or closed (was told to kill power to slide when I hear the motor sound change).