The Europeans pull 'caravans' all the time with the 300d. In fact the 300d in Europe would be considered a heavy towing vehicle. They pull caravans with the 200d's.
The cars came with factory hitches in Europe. If a 300d is not a tow vehicle, it's not a driving vehicle either.

Can someone elaborate on the differences in transmission heat production from driving a heavily loaded car and pulling a lightly loaded trailer? I've pulled a trailer over the Rockies with my 85 TD with a total load of around 2000lbs (as I recall--I wrote a thread on it). Most of the load was in the car but some in the trailer. No evidence of problems after having done it.

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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