Expecting no marks from the roller is unrealistic. The real question is whether or not they are causing a permanent indentation on the bottom material. In that case, the bottom of the slide is likely too soft to carry the weight. I don't have direct experience with this issue, but I know that Forest River provided stainless plates to add to the bottom of some slides on their Berkshire motorhomes for similar issues a couple of years ago.
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2017 Seismic 4114
2016 Chevrolet 3500 CC, DD DRW
1 Wife, 2 Kids under 12
Camping nights: 2019 - Too many to count, 2020 - 3
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