Yup, I can. I was one of the designers of the GSP9700 road force balancer.
You can indeed get four defective tires at once, because lots of tire manufacturers are more proud of their prices than they are of their tires. If the GSP9700 said you have tires with very high road force values, you can believe it.
There is no substitute for good tires. I suggest getting rid of the Goodyears and getting some Michelins. I buy only Michelin for my vehicles. I have LTX M/S in 165/70R16 on both a '00 Tundra and a '01 Sequoia. I'm VERY pleased with them and both vehicles have no vibration problems at all.
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