D100 pull my Duster?

And... makes a difference of your /6 is wore out or GOOD! Yep, flat or somewhat rolling.
Like said, get a trailer, put a car on it and see if it suits ya.
WE have pulled large steel/and or aluminum stock trailers for 50 odd years, from 350 cab over Cummins 10 speeds down to 1T 454 Chevys to 7.3 Int. Ford to many 12 v. Cummins to even the slant pulling a little car trailer. It ain't always how fast ya get there, it is getting there and back! Stay outta OD!

Yea I loved that 88 1/2 T. Dodge with that /6 with the OD but did not love to pull my car trailer with it, I was used to a 1 T something or Cummins. But hard times were upon me back then, my 95 year old mother passed, I sold my 89 1T. Cunnigns to pay for the funeral, in the middle of a divorce, that slant truck made the trips several times till if found the next ride, a 93 3/4 T. Dodge with a 360 and TF.

Whatever pickup I was pulling with, I always said the trans heat will kll that before anything kills the engine..more'n likely! :thumbsup: