We have a Discovery 40X and when the large slide comes in it leaves dirty black marks on the carpet at the end of the slide. I got a piece of the plastic floor covering with the spikes on one side to keep it from walking, and cut two strips so when the slide starts in I put those down and it protects the carpet from those streaks. With two dogs the carpet has been a real headache to keep clean. Every trip requires a carpet cleaning even though we go shoeless and on rainy days we towel dry the dogs feet. I was considering laminate wood flooring but with the slide leaving marks on the carpet, I'm afraid that the slide may scratch the flooring. Anyone have any ideas???