The Lexus GX 550 Overtrail+ is a genuinely impressive reinvention of Lexus body-on-frame luxury SUV. The twin-turbo V6 with 349 horsepower and 479 lb-ft of torque provides a massive improvement over the previous naturally aspirated V8, with better performance, efficiency, and refinement. The Overtrail+ trim is purpose-built for adventure with an electronic locking rear differential, stabilizer bar disconnect, all-terrain tires, and a functional roof rack. The 14-inch touchscreen and Mark Levinson 21-speaker audio create a premium cabin that rivals the best in the segment. Where the GX truly shines is in its dual personality: composed and quiet on the highway, then genuinely capable when the pavement ends. Build quality and reliability expectations are excellent given Lexus track record. The only notable weaknesses are a third row that is tight for adults and fuel economy that reflects the body-on-frame construction. For affluent outdoor enthusiasts who demand luxury and capability in equal measure, the GX 550 Overtrail+ is one of the best choices available.