I purchased walkie-talkies and have my wife get out & tell me how far back into the campsite I can go before the stabilizers go off the pad. Saves me from jumping out several times. I always back slow & wave people by if being followed by others before backing in.
I also have my wife sit in our boat(with walkie-talkies) when backing up to see if I'm lined up with the boat launch ramp or if someone is running behind me when backing up(kids). I own a pontoon boat (21') and a small fishing boat (17') and it seems the smaller the trailer, the harder it is to back straight back(like boat ramps). I can see the end of the travel trailer alot easier and get lined up with the edge of the campsite.
Oh, and I too have had alot of observers staring at my backing skills into campground sites since we have to wait until we get off work to hitch up & go. My wife will say well, you've got alot of people watching....nothing like alittle pressure not to goof-up and act like a first time beginner!