Cab replacement questions...

[Bears63]

My '78 K30 is rusted badly. No surprise there here in South Dakota. Well, I recently checked with the county Treasurer's office (they handle vehicle licensing here) because I was thinking of just replacing the cab. I found out that in order to legally replace the cab and apply for a new title I would need the titles of BOTH vehicles, fill out an affidavit and submit BOTH titles to the state to apply for a new title. Makes things interesting seeing as most parts trucks and cabs are sold without titles. So, my curious question is.... What are the laws in other states? I am very curious on this.

Mods, sorry if this is in the wrong area, please move it as you see fit.