question about wheelbase ? swapping cabs/beds

[chritter51]

I am about to start a build on a shop truck.
here is what I have: an 86 single cab long bed & an 86 crew cab long bed dually. I want a half ton 5 lug crew cab. I don't mind putting regular long bed and suspension on dually and having long bed crew 5 lug half ton. but I was wondering if I could put crew cab on my half ton dually and use a short bed?
just wondering. thanks for any input.
chris