panhard bar
https://www.youtube.com/watch?v=liR1--EHMg8
how about dual torpedo tanks, one on each side. crossover fuel line between them or frame mounted fuel pump with a tank switch over valve (like the old days, lol) or a tank on the inside of the frame with a sister tank on the outside of the frame-same side. under cab tank outside of frame on each side? S10 tank next to frame? (dunno size)
http://www.tanksinc.com/index.cfm/pa...rod/prd591.htm
custom tank fabricator. possibly stainless or plain old steel if they don't wanna do aluminum? may depend on what you plan to run for a fuel pump-in tank-on frame?