I am getting closer, here is what I am considering:
Auxiliary Wedge Tank (63 gallons - $650 including shipping):
Fuel Gravity Feed Installation Kit ($80)
and for the Toolbox solution ($405):
or a different style ($505)
I like the toolbox style since it is accessible from the tailgate with the rig hooked up. So it appears for a little over $1200, fuel capacity is increased to almost 100 gallons and a large locking toolbox can be added as well. Now if I can just get the banker (DW) to agree with me! Guess I will have to figure out the DIC later?
Bingo