Mike this has always been an issue somewhat. Most of the floor surface damage occurs from retracting the slide with dirt or grit on the floor and from the slide moving slightly as it goes down the road.
Newmar made guard that fit beneath the rollers, but they were not ideal in my opinion. I have always used non-skid rubber place mats under each wheel's track. It is only the large slid you need to be concerned with as the track of the apposing slide does not protrude beyond your view.
For the place mat solution, you will need to look and mark the track of each roller, I believe it is about 5 of them. Place them and watch they do not slide while you are retracting. If so just step on it briefly until it grabs.
Hope this helps.
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