As the most commonly used mobile refueling unit in the Air Force today which mobile refueling vehicle is equipped with a 6000 gallon tank with a 3 expansion spac?

The most commonly used mobile refueling unit in the Air Force is the R-11 refueling truck. It is equipped with a 6,000-gallon tank and features a three-compartment design, allowing for the transport of multiple types of fuel. The R-11 is designed for efficient refueling operations in various environments, supporting both fixed-wing and rotary-wing aircraft.