External fuel tank mounted in bed - thoughts??

Plumbing it can be a challenge, so that it still meets EPA requirements, unless you have one with a pump and hose with nozzle on it - but usually those style are only on farm trucks.

If I ever have the cash to add a tank, I will replace the OEM tank with a larger tank from Titan Tanks, that way I still have full use of the bed for hauling extra camping gear, firewood, etc. on the long trips I take.

http://www.titantank.com/