Based on the recently introduced Dodge Ram 3500, the T-Rex boasted dual rear axles and six-wheel drive nearly two decades before the Mercedes-Benz G63 AMG 6x6 did it. A production-spec 8.0-liter V10 engine powered the truck down the road, courtesy of 497 horsepower and 593 pound-feet. A conventional transfer case sent 52 percent of the engine’s power rearward to a secondary transfer case, which doled out the twist equally between the two rear axles.