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Not trying to be funny, but I use anything I can, a Curb, Rock, Brick... I try to only park where it is flat and make darn sure it is locked in park. I have the parts to put in a hydraulic Brake Lock for the rear brakes but have not had the time to do the install. I got it from Speedway Motors:
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.