The trick with balancing is that they have the correct adapter to properly center the Toyota wheel. A lugcentric adapter works but so does a proper hubcentric one. My 285/75/16 Revos took very little weight. If you are getting steering shake and very little vibration in your feet then you have an alignment problem. The 4Runner is very castor sensitive. If the vibration is in your feet and the steering wheel you'll have a balance problem. Are the tires the same size as the old ones?

Lars,
Gold Coast Cruisers |My 4Runner