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???