I suspect if it looks expensive enough they wont care, I bet lockers and panels where the underun bars usually are, some chrome trim and a professional looking shiny paint job would make all the difference.
It's not the vehicle they don't want after all, it's the type of person they assume is inside it.
It was unfortunate as our first time on a camp site and first trip in the truck. But there are also brilliant small sites out there. At the end of the day, if they don't want our money, there are lots that do.