I tried that Dan but nothing really happened.EDIT
BUT and I got a big one. I did try a few more things. When I "IMPORT" a .3ds I pick the file name and there is an option button under the proview window (no previews show for .3ds just .skp files )
In that option area there is a checkbox for "merge coplaner faces". This works. It turns the two triangles of a flat face back to one polygone.
Hate learning new programs.
Now I don’t see the two million extra lines on the rounded part of my camper.
All though it still looks the same.
Pics are a little fuzzy because I scale them.