I'm getting der gulden luvwagen ready to sell and looking at what seams
(sic) to be minor seam rust on the drivers side.  I decided to poke at it
to have a better idea how bad or minor it is for prospective buyers.  I did
some dremel grinding on the worst area and didn't find any rust penetration
of the metal.

It seemed like the vertical panels have a 90 degree bent section on each
that are parallel to each other and extend deeper into the van than I
expected, and then the seam filler in the gap and paint over that.  probing
back into that gap with very thin metal it felt like that slot was 1/2-3/4"
deep which was more than I expected.  How are the body panels actually
connected in there? Any advice on how to stabilize the seam area short of
full the on interior removal approach?

Thanks,
Edward