Bruce Jenner — Wrecks Truck in Brutal Off-Road Race

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Bruce Jenner got tossed into a Mexican ditch, and is lucky to be alive … after wrecking his million dollar ride in the legendary Baja 1000 off-road race. 

Bruce and his son Burt Jenner were taking part in the brutal competition — in which multiple drivers and audience have been killed — when their suped up truck rolled on Thursday. 

We’re told Bruce was behind…