A couple of years ago I installed a cabinet lock on the upper door of our TM trailer so that we could lock the upper door (from the outside) as well as lock the door knob. This is one of the previous discussions about "dead bolts:"
http://www.trailmanorowners.com/foru...=7852#post7852
The photos unfortunately disappeared from these messages on the old TM website when it transitioned to this new one. I'll put up a couple of photos of my cabinet lock tomorrow if you wish to see them.