Welcome to yotatech and a Happy New Year. I have a friend in Bethlehem, Pennsylvania whom exports US cars to Germany and other parts of Europe. He has been doing this for 25+ years and he can evaluate a potential purchase for you. Good luck in your search.

 

here is my Trekker build thread if you want to check it out:
https://www.yotatech.com/forums/f197...thread-117523/

one of the first few pages shows some of the rust that 1st gen trucks can experience.
The floors tend to rust out under the floor at the 4 corners of the cab.
On a trekker one thing you want to look for if you can see it is rust between the roof of the cab and the canopy..Winnebago did a poor design when they sealed it.
this is an example of what you don't want to find:

hard to tell if you the top is not pulled though and that is a major pain.
you can pull the cab vent and put a camera up there to try to get an indication if there is any major rust:

 

Welcome to the family Branko... good to see another Dutchman signing up... there are a few members from Holland here... my family is from Limburg... my Nederlands is neit so good... much worse than your engels so don't worry... good luck with your search...
Proficiet Neu Jaar...