New member / shopping question!

[55reasons]

I have a project in mind that has lead me here to start a build project.

I understand the C30 was a dually, and although I'm sure I could save a lot of steps by starting with a C30, they seem to be pretty hard to find.

So, has anyone successfully converted a C10 to a dually?

After prowling this, and other sites, I'm looking for a 8-lug bolt pattern. Most likely a 14-bolt 10.5 rear that I'll narrow to fit.

I don't want to spoil it with too much info as to why I want a dually or why I need an 8-bolt, but it will be primarily used as a tow vehicle to haul my 55 VW and 50 BMW to shows etc.

I have access to a whole row of rust-free 64 - 66 C10 and C20's (small back windows) in various stages of completion to choose from.

Any suggestions from the veterans as to the best starting point for a dually conversion?