The reason I say 19.5s won’t fit a 1.5 to. Is the backing plates on the rear. Almost no clearance with 20s.
thanks Tony, thats a clear picture.
So using the world famous phote editing tool Paint, I took 2 pictures of the rear rim and put it together to see what the dually would look like
the rims are 5" apart, I'll ask the fab guy is he can widen the rim outward, so the come closer together and I win an inch per rim to run 265/60/20.
Also I looked at the front rim and I don't like how far it's sticking out from the drum.. 1 possibility is to widen the rim, but..we have no power steering

Secondly I came up with the idea to moon them, if thats a verb.