Richard Shabel, a heavy mobile equipment mechanic at Maintenance Center Barstow aboard Marine Corps Logistics Base Barstow, adjusts the air tank on the M-105 trailer that controls the breakaway braking system. The system locks up the brakes if the trailer ever becomes detached from the vehicle towing it. - Richard Shabel, a heavy mobile equipment mechanic at Maintenance Center Barstow aboard Marine Corps Logistics Base Barstow, adjusts the air tank on the M-105 trailer that controls the breakaway braking system. The system locks up the brakes if the trailer ever becomes detached from the vehicle towing it.