The heavy-duty axles lent themselves well to oversize Michelin 14.00R20 tires. With a 15-inch width and a 49-inch overall diameter, in very soft sandy conditions, these tires can be dropped to 17 psi in the front and 26 psi in the rear. The Magirus has a maximum speed of 75 mph. At high speeds, it sucks in fuel at a rather thirsty 8 mpg. If you slow down to 50 mph or even slower, you can get as much as 13.8 mpg.
Thomas' first job was to completely strip the frame and galvanize everything that could rust. New spring packs were engineered for high-speed 4x4 use that might be necessary in the Sahara Desert and for the autobahn. Heavy-duty gas-adjustable shock absorbers were fitted.
The battery box and the onboard compressor air tank were relocated to make room for the two four-chamber 128-gallon custom aluminum diesel tanks on the outside of the frame. Aluminum skidplates under these tanks pull out as work or camping tables. The original 18-gallon diesel tank was retained to allow uninterrupted fuel delivery on steep grades. All brake and air lines were replaced with fireproof tubing in the event the vehicle had to be driven through a brush fire.
Turning his attention to the cab, heavy steel plates were welded into the floor to protect against land mines, not uncommon in Libya or Mauritania. A full rollcage was integrated into the cab. Thomas located a bank that was being decommissioned and before the demolition crews arrived, he salvaged the bulletproof glass, which was used in doors and windshields, eliminating the possibilities of anyone breaking in. Any parts of the cab that couldn't be made from aluminum were galvanized, including the cab frame.
The locking box above the cab was designed to function as storage for large items like foldable bicycles, a raft, and mountaineering and recovery gear. A throwback to his Land Rover days, it also serves as a tropical roof, reducing the need for an air conditioner.