We've never stayed in a commercial campground with our camper. Have only drycamped with it.
Sometimes we overnight in Yukon gov't campgrounds (no services) but usually boondock down some backroad. Didn't make any modifications to the camper, other than a memory foam on the bed and Torklift steps, and a black vent cover over the bed to help block the 24/7 daylight in May/June/July. It's a 'small' 8' unit with everything we need.