Majestic Formed Plastics makes glides (or whatever you want to call them) that go under each end of the slide. That's just one company and the product I've used on our last rig and this one. Some dealerships carry them, or you can get them directly from them. They're pretty inexpensive. Had them installed on last rig and newer one from day 1, no problem. It should be standard on ALL RV's, since most all flush floor slides have this same problem.
John and Rebecca Dickson
Emma-7 / Little John-5 / Iva-1
Full Timing Again, Rev B
2013 Ford F-350 Lariat CC LB PSD
2015 SOB TT - With OC's Awning Poles (#8)
At least in Heaven, RVs will be perfect, and I won't have to keep fixing them.