Renting Class C for Nat'l Parks Roadtrip

I found the best thing to leave at my campsite while gone for the day (I have a Class B van), is an erected tent. They convey quite clearly the campsite is occupied, the small ones are less than $20, pack up and fold into almost nothing, and not nearly prone to theft like a chair or traffic cone. This strategy does not work in campgrounds that require hard sided campers because of bears (the ranger will visit you with a tent set up) and is not necessary in campgrounds that assign sites as long as you let the office know you have left for the day not abandoned your site and reservation.