Good plan. Link the local one on this thread so people can comment. I don't believe there is any connection between NA TD's and third row seats. The third row seat can be retrofitted. Personally, I would get a turbo and not an NA version. There are far more turbo versions available on the market. You'll need to get the correct receiver hitch to tow a load like that. Don't use a bumper hitch.

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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