Gas tank options other than....

[496 BB]

I have 3" body lift on my truck and plan on keeping it. I dont however like how you can see the tanks nor do I care for them being outside of rails. Ive searched and read about the blazer/sub tanks out back as that was what I had in mind but seems they stick down quite a bit as well from back side. Then I looked into fuel cells and not seeing exactly what I need for a reasonable price. I can not mount a filler in the bed as there will be a salt box spreader in it for winter and not sure I want the whole process of behind the light as that would take a minute to do.

What other options do I have that are 20 gallons or more? With using existing fuel door or something not in bed to fill?

BTW-6" suspension and 3" body lift so got some room to move around.