There are several places that you can legally park overnight throughout all 50 states. Most Walmart parking lots are open to camping (unless there is a sign stating otherwise) and other places like Bass Pro and Cabela's are typically open to it as well. Truck stops and welcome centers off the highways are also options for overnight camping, too.  While these locations might not be glorious, they're options to easily camp and park your rig for the night. Plus, they don't cost a dime. You can easily camp at any of these locations and save some money as you're traveling down the road.