Transfer Flow also makes replacement tanks that go under the truck. Having an older Ford with two tanks we replaced the originals with a 40 gal. front and a 31 gal. rear. allowing us to keep our spare tire (it hangs about 4 in. lower). Just a note of caution, some states do not allow a gravity feed from an in bed tank to your original tank. It has to be pumped. I've heard a real stiff fine if caught. Don't know for sure but just what I've heard. Maybe someone else has more info on that. Transfer Flow's website has some info there too.
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