Yes try all those things already mentioned. I had the same problem, did all that. In the end it turned out to be what is called a gear pack that the slide rides on going in & out. There are two. The bearings were worn out. (Lots of slop) Be sure to check as if not corrected it can also take out the teeth on the slide tube rails. Caught mine in time and just needed gear packs & bearings. (one piece) You will find the gear packs just inside the frame rail. HH II has a Lippert frame. http://www.lippertrepairparts.com/lippert-slide-out-gear-pack.aspx