Mercedes trucks like the 307's, 207,s 407's and Sprinters are available with a double bucket seat on the passenger side, making it a three person front seat. They are also available as crew cabs with a second row of seats. Ford Transit's are also available with the same seating arrangements.
If you find an aftermarket source for the double bucket, let me know, I'd like one for my 409d.

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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