Skid mount
From Infogalactic: the planetary knowledge core
A Skid mount is a popular method of distributing and storing machinery[1] for the military and industry. Simply put, the machinery at point of manufacture is permanently mounted in a frame or onto rails or a metal Pallet. The equipment can then be easily and securely transported and used as a unit. A unit such as a fire-fighting Skid unit may also be temporarily placed onto a vehicle to equip it for a task.