2003 Lexus GX 470 Owners Manual - Page 847

DRIVING TIPS NOTICE D Do not install weight distributing hitch to weight carrying hitch receiver because it will damage your vehicle. D Do not use axle−mounted hitches as they can cause damage to the axle housing, wheel bearings, wheels or tires. Also, never install a hitch which may interfere with the normal function of an Energy Absorbing Bumper. Trailer ball Follow these easy steps to properly determine the correct trailer ball for your application: 1. Determine the correct trailer ball size for the trailer coupler. Most couplers are stamped with the required trailer ball size. The sizes you'll most likely find stamped on the coupler are: Trailer Class III II I Typical Trailer Ball Size 2 5/16 in. 2 in. 1 7/8 in. " 1 3 Trailer ball load rating 2 Ball diameter Shank length 4 Shank diameter 3. When mounted in the ball mount, the threaded ball shank must protrude beyond the bottom of the lock washer and nut at least 2 threads. The trailer ball shank must be matched to the ball mount hole diameter size. NOTICE Only use a ball mount attachment specified for the Lexus GX470. 2. Select the appropriate trailer ball to match or exceed the gross trailer weight rating of the trailer. The trailer ball load rating should be printed on the top of the ball. 350