The Safeguards Transporter (SGT) is a specially designed part of an 18-wheel rig that incorporates various deterrents to prevent unauthorized removal of cargo. The trailer has been designed to protect the cargo against damage in the event of an accident. This is accomplished through superior structural characteristics and a highly reliable cargo tie-down system similar to that used aboard aircraft.

The thermal characteristics of the SGT would allow the trailer to be totally engulfed in a fire without incurring damage to the cargo.

The tractors are standard production units that have been modified to provide the federal agents against attack. Escort vehicles accompany the tractor-trailers during transportation activities.

These tractors and escort vehicles are equipped with communications, electronic, and other equipment that further enhance en-route safety and security.

The vehicles used by NNSA must meet maintenance standards significantly more stringent than those for similar commercial transport equipment. All vehicles undergo an extensive maintenance check prior to every trip, as well as periodic preventative maintenance inspections. In addition, these vehicles are replaced more frequently than commercial shippers. As a result, NNSA experiences few en-route breakdowns and has had no accidents due to equipment malfunction.