Good Or Bad Idea? Sell My 1990 Suburban 4x4 1500 For Same Year or 80s GM Dually 4 Door ?

[blackandgold51]

I got a 1990 Suburban 4x4 GMC 1500 with 350 V8 TBI . I wanted to do a dually conersion with it however I also been thinking about selling it to get a 1991 or 80s GM Dually pickup 4 door .

I also wonder where I can find them cheap.

I stay in New Orleans