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Rick's Hot Rod Shop has dimensions for many trucks on hand, but they can also make a custom tank to your specs. This is what I needed them to do for me, especially after raising the bed floor and gaining all that extra room for a bigger tank, which wound up being 28(w)x24(l)x12(d) inches. If we multiply all those together, it's 8,064 cubic inches. Divide that by 231 and we'll get the amount in gallons--almost 35!