No, it's not some kind of mysterious truck tank -- you've just stood in the shadow of a heavy-duty dually truck. A dually, or a dual rear-wheel truck (DRW) if you prefer the official nomenclature ...

Carralero found inspiration in the Ford F-450 dually pickup truck his team was building. "We put the wheels on a pallet jack and slid them onto the truck against the hubs, and were like ...