Truck owner wannabe

[billsnogo]

Hello all. New member that hopes to be not just a browser, but a participant in the Chevy Truck club. Hope to get a 3/4 ton, 1 ton or my dream, a dually.

A few questions, how many 73-87 duallys were put out by the general? I rarelly see any, and when I do they all are crewcabs (not a bad thing!).

Lets say if I were to buy a C30 or C20, what would I need to do to make it a dually other than get the dually axle? Would a dually axle from a similar year drop in, or would there need to be other changes? How about the front rims? Are there a spacer needed?
ps
anyone have a 3/4 ton or 1 ton in Minnesota they are selling