We ran into a place like that once south of Grand Rapids, MI. We planned to visit the Ford Presidentlal Library site and wanted something not to far out of town. Found a resort on Hwy 131 and pulled in to the office. There was a sign on the door with a phone number to call so we called it. the lady that answered smugly stated that truck campers weren't accepted there before I could say anything more than "Hello" so she was obviously looking out a window somewhere watching us. So we sat there for a bit, looking at a map and looking on the internet to find another option, all the while enjoying the thought of the smug lady nervously watching us. Then we drove a few miles over to Yankee Springs Recreation Area where we found a nice, nearly empty campground on a lake. I was glad we'd been turned away from the first place!