Minivan rear window wiper motors are compact, powerful and adaptable. You have mad skills so I bet you can use one of those and sort this out.
Or one of you Dakota donors could be looked at and see if it could be made to work.
The problem with mini van rear wipers is the sweep. Most rear wipers have a sweep of around 120-130 degrees, I'm thinking 100 degrees is going to be a lot and the wiper blade might travel off the edges of the windshield.
I have a full wiper system here off a Dakota. I would have to customize nearly every piece to use it, then hog out the wiper post hole in the roof skin from 1/2" diameter to over 3/4" diameter, then make brackets to mount everything. The wiper system on my 48 Plymouth coupe is from a Dakota, this truck would be much more difficult. I was hoping for an easier option.
