I'm a little confused about the idea of "turning the Scamp handle 180 degrees."
The problem, as I understand it, is that the factory position of the door handle (pointing toward the front of the trailer) allows the weight
of the lever to rotate against the locking mechanism while the trailer is bouncing down the highway, causing it to wear out prematurely. The solution I have heard is to rotate the lever 90 degrees
(pointing toward the ground) so that there is no tendency to rotate when you hit a bump.
That would reduce premature wear on the lock mechanism, but it still wouldn't ensure that the latch is fully extended behind the striker plate when you close the door for travel. You would still need to retract the latch by turning the handle, close and press firmly on the door to compress the seal, and release the handle to engage the latch behind the striker. The real culprit is the door seal, which is quite firm when new and loosens up over time. The new style flanged seal may be exacerbating the problem, since it is a tighter seal that the old style.
I agree that a modern latch with an integrated deadbolt would be a big improvement. But Scamps are, well… like VW Beetles.