|The following is based on Van Buren and has not been confirmed by canon sources.|
Sandia National Laboratories was a national laboratory tasked with research and development in matters of national security and nuclear science for the United States government.
They were involved in designing and testing mobile vaults built to withstand head-on collisions at 60 miles per hour without their contents so much as shifting, and to endure a 1,850 degree fire for half an hour (the equivalent of a crash with a gasoline tanker) without raising the temperature inside. Their metal linings are designed to resist drills, blow torches, and explosive charges. Despite being a highly resistant vehicle it is not capable of intensive off-road travel as its suspension and tires simply can't cope with the stress.