There's at least one of those for sale in the US at the moment. There's someone over at ExpeditionPortal who took one on a trail ride in the recent past.

Here it is:

http://www.expeditionportal.com/forum/showthread.php?t=20766

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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