Auxiliary fuel and transfer tanks: range, or refueling equipment
There are two different products here and they are regulated differently. An auxiliary fuel tank plumbs into the vehicle's own fuel system and extends its range. A transfer tank carries fuel to refuel something else — a generator, a tractor, equipment on a site — and is not connected to the truck at all.
Replacement tanks are the third option: a larger tank in the factory location, which is the cleanest answer for range without giving up bed space. Diesel is the common case, and gasoline carries stricter rules on venting and on what may be carried in an enclosed bed.
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Regulations, weight and bed space
Transfer tanks for fuel carried in a bed are subject to DOT rules on construction, venting and labeling, and those rules differ between diesel and gasoline. Check what applies before buying rather than after.
Fuel is heavy — roughly seven pounds per gallon — so a large tank meaningfully changes the loaded weight of the truck and where that weight sits. A tank in the bed also competes with a tonneau cover and a bed rack for the same space. We stock 24 fuel and transfer tank parts from 1 brand.