Out here in Oregon, Washington, and Idaho I have never had an issue dropping the camper. I usually do this if I am staying more than 3 days, and have something to do in the area like transporting my kayaks to and from water bodies, or just sight seeing.
State, and County Parks seem to be the most user friendly for us TC owners. However, privately owned campgrounds can be feisty and may quote you made up laws that refer to the "dangers" of unloaded truck campers in the event of a fire. Just cross your eyes at them and tell them you will spend your money elsewhere, maybe even Wal*Mart before bothering to patron their park.