We have had our Bighorn 3585 for about 10 months and love it. Before the warranty runs out though, I am worried about a dent that is in the vinyl floor that is where the wheel from the slide rests when the slides are in. I noticed this after our first long trip last summer and it is just getting deeper with each trip. Our dealer acted like this is what slides do. Is this the nature of the beast with slides or something we should object to stronger?