Dodge or Freightliner, same vehicle. I've talked to a Fed Ex mechanic. He did not mention any problems with chains, and I specifically asked him about any problems. He said, EGR's were a problem and they go thru a lot of tires. Apart from that no problems and he was looking after a fleet and had to be connected with the whole system of Fed Ex maintenance mechanics. I don't think anyone on the Yahoo group has had problems with chains. Some people there have over 100k on their vehicles and a few over 200k.
It is the 160hp 2.7 5 cyl diesel. I think it is also used in automobiles. I have no idea if it has twin cams.

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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