Daniel, I have a couple questions....did you pre-drill the holes? If so, what size & kind of drill bit did you use? As I'm not too great with the fix 'em stuff, I need all the help I can get.
Joan, glad you got it figured out. In case she's still not 100% certain, tell her it's their home-made door strike for the Bargman L300 door lock. I believe it's what they use on their new trailers.
Proper installation may be a bit tricky depending on how you tackle this. The door strike can be secured with the rivets that come with it, but that requires the use of a riveter tool! Not to worry, it's much easier than it sounds, but cannot be done if you don't have the right tool. Alternatively, I guess you could use small bolts with a nut or two on to hold it on the inside. The idea is to make sure they don't come loose easily, and the whole assembly needs to be sturdy enough to withstand the multiple door closings and the occasional slammings. As to pre-drilling, you need to understand that you're poking holes through fiberglass, and you most definitely need to pre-drill holes, and the holes need to be of the right size (which depends on the rivets or bolts). So there's a bit more to it than wood for example, and it's something you should get familiar with if you ever need to fix other things around the trailer. In my case, there were 4 holes, two of which go through the edge of the door opening, and two others that end up inside the cabinet at the corner. I also decided to plug the old holes with a bit of fiberglass resin.