I love these trucks; they are good for smiles/mile. That said I can't think of a better way to kill the joy then turn a fun hobby into a obligation I depended on for income.
There are a billion vehicles you can buy, fix up, sell for profit. Have you done that with an easy to sell vehicle? Because you're thinking about doing it with a niche vehicle that has the trifecta of limited appeal, hard to find & expensive parts, and registration/insurance issues. You'ld probably make more money fixing/flipping Hondas and Toyotas in need of an engine or trans.
Vehicle restoration is more an infatuation then a sensible financial decision.