Online wholesale RV dealers - any experiences?

RV Wholesalers has a good reputation on this forum. When I go to the state park camping near them we always stop in to see the units. They started off with 1 small gravel lot and few units across the street. This year I stopped in and they still have the original gravel lot but now have 2 huge paved lots across the street with a ton of rv's on them. They must be doing something right.