I've never seen a Westphalia 408d. If you go to www.mobile.de and search on 408d's you should find a lot of them. There were a fair number of different companies making motorhomes on that chassis back in the 70's as well as a lot of individuals doing their own conversions. Be advised that typical top speeds on those vans are around 55mph. Some did a little better.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13