When we removed the carpet from our "new to us" Journey, we extended the slides fully. At that point there was only about 4 inches of floor that we could not reach. We mfg'd a chisel from a length of 1/8 x 2 inch x 24 inch flat bar (from hdwr store) and used that to reach under the slide to knock out the carpet nailer, worry out the staples, and scrape out the carpet backing. When we laid the tile, we used the same tool, with a piece of 2x4 as a fulcrum, to reach under the slide to firmly press down the new tiles. Then with the slide still fully extended, we drove staples through the new tiles as close to the slide as the nose of our stapler would allow. You won't see them unless you look, and they will prevent the tiles from slipping out beneath the slide (because tile cement never really hardens).
Our slides do not touch the floor tiles, but our EZ Rest sofa bed had hard plastic rollers that marred the tile. We replaced them with neoprene wheels. Justincase, we put one of those self adhesive 4 inch diameter teflon furniture sliders at each corner of the slide. You don't see them, they are underneath.
Fair Winds and Following Seas
Terry & Rosalina
2007 Winnebago Journey 34SE
Retired Navy Mustang & Navy Wife