Hi Sid,
I don't know if this will help you or not, but I had pretty much the same issue on my trailer; couldn't get the screws to tighten on the hinge where it attached to the trailer. Inside the wall there are nuts on the other end of the screws. A lot of Sikaflex, or possibly Vulkem was used to seal around them on the inside. At some point, those nuts worked loose, breaking free from the sealant, and would then just spin on the end of the screws, unable to re-seat themselves. I had to drill the rivets on the door frame trim, and ease the interior metal back to the point where I was able to at least get a wrench on them. They are still not as tight as I would like - will have to go back in at some point in the future and see if I can snug them up a little more. You can get to them, but that's sort of what's involved.
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