I installed an RDS 40 GA tank / tool box, I use a fuel pump to transfer fuel when stopped. The tank is low profile, so if fits under my tonneau cover. I didn't go with the gravity method because I don't want to give Ford any excuse to deny warranty (yes very paranoid), also the truck's computer (distance to empty) doesn't handle fuel being added while moving. Usually we have to stop due to full bladders (human and canine) so stopping to move fuel isn't a big deal.
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