A Skid mount is a popular method of distributing and storing machinery 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

Pallet

A pallet , sometimes called a skid, is a flat transport structure that supports goods in a stable fashion while being lifted by a forklift, pallet jack, front loader or other jacking device. A pallet is the structural foundation of a unit load which allows handling and storage efficiencies...

. The equipment can then be easily and securely transported as and used as a unit, a unit such as a fire-fighting Skid unit

Skid Unit

A Skid Unit is the common name used to refer to a complete self-contained fire fighting apparatus designed for use on/in commercially available vehicle platforms. Vehicles such as pickup trucks, flat bed trucks, vans, off-road vehicles, trailers and others can easily be fitted with a proper size...

may also be temporarily placed onto vehicle to equip it for a task.