Relocated fuel tank

[Kiwi]

I have a 1971 Chevrolet C-10 with the stock fuel tank mounted behind the bench seat. I would like to remove the stock tank (for added cargo space, to get rid of the sloshing should when driving, to eliminate the fuel smell in the cabin, etc.) and install a new fuel tank somewhere under the bed.

1. I've hear of guys using a stock fuel tank from a Surburban ... if so, does anyone know:
- Where does it mount?
- Where does the fuel filler neck/cap exit?
- What year/model of Surburban is the tank from?
- Any special mods required to install the tank?

2. Is there a good aftermarket fuel tank that guys have used successfully when mounted under the bed. If so:
- What brand/model of tank
- Where does the fuel filler neck/cap exit?
- Any special mods required to install the tank?