If your slide is deep and your tile is highly polished (what were they thinking?), we picked these up on a service visit to Fleetwood. They purchased them for us and we've been happy. One side is tacky carpet that 'sticks' to the floor. You put the end under each roller and slide in and out. A little expensive in my opinion, but then, so is replacing marred tile.
Habegger Flooring - Online Store
There are also tacky carpet replacement pads. Those pads are very helpful for keeping the guard in place when rolling in the slide. Thus far, we are still on our first set of pads.
2015 Providence 42M, Toad - 2002 PT Cruiser with Air Force 1 brake system. Cummins 450 ISL 9L), Allison 6-spd transmission, Freightliner chassis