Apache...I don't know if your going for total authenticity but here's what i did with mine it's POR-15.
It's very hard wearing and should be good corrosion protection.
Something i'm sure you'll need for those cold German winters....
Do they salt the roads in winter there?

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.