What is a mobile refueler?

A mobile refueler is a bulk storage container onboard a vehicle or being towed that is designed or used solely to store and transport fuel for transfer into or from an aircraft, motor vehicle, locomotive, vessel, ground service equipment, or other oil storage container.  Mobile refuelers may be found at the following non-transportation-related locations: industrial sites, airports, military bases, construction sites, chemical complexes, mining sites, seaport terminals, and tank truck home bases.