Auxiliary Tank Toolbox Combo

Auxiliary Fuel Tank Toolbox Combo for Truck — ATTA & Transfer Flow
The best auxiliary fuel tank toolbox combo for truck extends your pickup’s operational range by 200–500 miles while adding lockable weatherproof tool storage — all in the bed footprint of a standard crossover toolbox. Our combo units come from ATTA and Transfer Flow: the brands fleet managers and working truck operators specify for DOT-compliant, warranty-backed extended-range fuel systems.
Auxiliary fuel tank toolbox combo truck reviews consistently recommend the Transfer Flow Auxiliary Fuel Tank Tool Box Combo ($2,813) for operators in California or anyone requiring CARB compliance — Transfer Flow is the OEM supplier to Ford, GM, and Ram for factory extended-range programs, and their direct-install combo carries the same engineering pedigree. The ATTA Diesel Auxiliary Tank & Toolbox Combo AT50TT ($1,675) delivers 50 gallons of additional diesel capacity in a DOT-compliant welded aluminum unit at a lower entry price — available in Dodge 1500 Eco diesel configuration ($1,725) and multiple standard bed lengths.
Auxiliary fuel tank combo buying guide — before you order: Confirm bed length compatibility (short, standard, long). Verify fuel type (diesel vs. gas — units are not cross-compatible). CARB states (CA, NY, MA) → Transfer Flow only. DOT certification required for on-highway use — all units in this category are DOT-compliant. Pump and meter sold separately: pair with a GPI or Newberry meter from our Fuel Meters category for auditable per-fill tracking.