To bad you are not in a campground, most RV locks use a similar cut on the key, so many times you can use a neighbor's key to open your lock.
What about using a coat hanger to access the key rig - you said that all large windows are locked, what about a smaller one?
My guess is that you can see where you set the keys down on the table or something? Like my RV, I can lock the bottom lock, then close the door behind me as I leave. But I keep a few extra keys around. I give them to friends when out camping, so they can get in if they want to- say while I am sightseeing. I don't give out the deadbolt key, but still keep a copy in my wallet.
Good luck,
Fred.