Though I'm sure there is a fix (and I'm still looking for a good one) I don't think this "J Hinged" thing will work on a "1966" trailer (which Rog0525 profile says he has). On the 1966-1968 (I know 1966) there is "no" hinge to remove or replace. I know on the 1966
model (I own three of them) the top "lip" of the door slides into a channel in the frame holding it into place, the door lock (at the bottom)then holds the door shut. This is the "BIG" problem with that style. On a 1966
even a "J Hinged" door would be nice! I have seen people attach a cable from the frame to the door (does not hold it in place, just keeps it out of the ditch if it comes un-done going down the road).
That fix works very well on the 1969 trailer on that did use the "j hinge".