I have a 2003 Scamp
and it has had door seal and closure issues since I bought it used 6 years ago. I've tried different 'D' seals and ribbed seals and finally decided to try the new stuff from Scamp
I put the seal all the way around the door, including the threshold. Then, I installed a door bottom slider from Scamp
(mine didn't have one). All was well except I had a devil of a time getting the door to close properly, which I attribute to a difference in thickness of the seal.
I've read most of the threads on the issue here and on other forums and so I'm aware this is a problem a lot of people have with their Scamps (either too loose and not staying closed or too tight and takes a lot of oomph to close the door).
What I finally ended up doing was the following;
a. Put some 1/8" aluminum shims on the hinges (body outside)
b. Put a 1/8" aluminum shim behind the door latch (on the inside)
c. Put some small washers between the latch and shim at the edge, to change the angle of attack of the latch bolt itself
This worked out really well. The door takes a little pushing (outside) or pulling (inside) to shut and latch, but now the bolt extends further into the striker plate and feels really solid.