Crewcab 4x4 single wheel (non-dually)

[XR650RKing]

Hey All I am new to this side b/c I have been hanging on the 69-72 blazer forum but I got an idea and since I don't have my interchangeable parts guide here I was hoping someone could help with my curiosity?

I used to have a long wheel base 76' 3/4 ton 4x4 and loved it...well now I'm married and instead of shelling out the dough for a new HD crew cab I would love to have a mid 80's crew cab 4x4 but don't need dually which is what I normally see.
Here is my thoughts...

A) question: how much different are the dually axels front and rear than the 14bolt rear and Dana front single wheel axels? (Can I just get a dually 4x4 and swap the rear-end and chop the fender flares?)

B) Get a 2wd dually and get an old 4x4 3/4 ton utility truck and rebuild and swap the front and rear drive train (is the 2wd dually frame same as 4x4, and is rear already on leaf springs...some 1/2 trucks 2wd have coils in rear vs leafs)

OR

C) what is your suggestion to get a long-wheelbase 3/4 crew cab in mid 80's model?

I don't need the dually for towing, but I want the 3/4 size for strength due to weight.

Any help is appreciated!

Thanks

JT