Guessing that your slides are similar to my TM, check the following.
Where the slide meets the coach floor, there is a long nylon "slider". I took mine to the dealer, where under warranty, he had to adjust the pitch. I got to look at the slide at that time and the pitch adjustment was done by adding washers at strategic points.
Later, when I tore out all the carpet and put in laminate flooring, I re-adjusted the nylon slide myself. Amazing what a cheap 4' level and some care to make sure the nylon slider is level can do to the smooth operation of the slide.
On the outside of the coach, where the slide rails are located, are tension screws that you can tighten, if you are careful. Over tighten the tensioners and your slide will catch.
The site for the slides, as well as the leveling system is: