So I read through all these, and I read a little about a 50 gal tank for the hemi. I don't have a diesel anymore, and I really only needed a half ton, but bought a 2500 for the solid front axle. I put a lot of miles on my truck (35K+ a year) and I would love to get more than 420mi per tank. I run 35" mud tires (not optional, need them for getting to and from jobsites). But unfortunately, I have a CCSB. Is there a way to retrofit an OEM tank or aftermarket 50gal tank into my SB??? In bed tanks aren't an option because of all the tools I carry around regularly.