We bought one of these to put inside the closet in the ex's mother's old decrepit trailer. We had to take over the trailer for her because she couldn't afford to park it anywhere and couldn't afford new tires.
Most campgrounds have dumping facilities.
I wanted to go tent camping, though. That big yellow trailer ruined the ambience of the forest and the trees. Eventually we bought a two room cabin tent, and put the port a potti in the 1st room with our luggage.
