It’s no unibody crossover. The capable body-on-frame Lexus GX 550 is all-new and ready to conquer tough terrain, tow up to 9,000 pounds or deliver a family of seven to the movies. The tough looking sheetmetal rides on a new fully boxed frame architecture that's shared with Tundra, Tacoma and big brother LX. The V8 is gone. Until the hybrid powertrain arrives, all GXs get their motivation from a twin-turbocharged 3.4-liter V6 that pumps out 349 horsepower and 479 lb-ft of torque mated to a 10-speed automatic. Tom Voelk travels to Tucson, AZ to drive a GX 550 Premium + model in Nightfall Mica.