I had problems as well... actually found a couple of screws that attach the coach mounted glide had broken and backed out... thus the damage... I purchased some UHMW, (ultra high molecular weight) plastic in 3/8" thickness... made a group of strips, 4" wide by the length of the slide... I counter sank some holes and mounted these strips... oh I'm guessing 16" to 18" apart across the bottom of the slide... I had to bevel the edge where it met the edge of the slide and ran across the glide mounted on the body... made sure that where the existing plastic sheeting was damaged, it was sealed and covered by one of the strips... BTW the guide in the bottom of the coach is made of the same material and it makes an excellent glide...
I made sure that the slide could sit 3/8" higher when closed... the slide now moves more easily (less friction).. the total cost was about $150. The only other repair my coffee buddy, (mechanical engineer) could come up with was to remove the slide, and replace the plastic sheeting... my project is now 3 years old.. and gets inspection each spring and fall before we leave to travel..
Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction