The fuel limit in vehicles loaded on the KC-10 and KC-135 aircraft is 1/2 tank.
In some cases, there is no fixed fuel limit for vehicles loaded on the KC-10 and KC-135 aircraft, as it depends on various factors such as aircraft configuration, mission requirements, and payload considerations.
However, vehicles should be loaded with a minimal amount of fuel to reduce the overall weight and to comply with safety standards. The KC-10 can carry up to 356,000 pounds of fuel. When loading vehicles onto the KC-10, it is important to consider the weight of the vehicles, as well as the weight of any other cargo that will be loaded onto the aircraft.