2020 Toyota 4RUNNER

Took the vehicle in 3/19/2021 @ 6076 Mileage for a steering wheel shake, the dealer has tried numerous times to fix it by trying to balance the tire and rotate the tires, it only masks the problem and the steering wheel shake comes back. The shake can happen at any MPH. I finally took it to another shop called discount tire and dynamic 4x4 alignment. Discount tire said there was coupling in the stock tires Nitto Grappler, so I replaced the tires with Michelin Defenders this only masked the problem. On 9/25/2023 a local Toyota Technician and I took a ride together to see if he could duplicate the problem. At 67 and 68 we were able to duplicate the problem when the steering wheel shook the passenger side of the car shook. The technician and I swapped and I was able to duplicate the problem as well. I was stopped at a red light and took off after the tires were warmed up. When I reached 67 or 68 mph the steering wheel began to shake and he confirm that the vehicle shook too on the passenger side. I have experienced shaking in the steering wheel previously but now its being felt in the vehicle too. Toyota sent out a technician on the last issue and I was told they found something and then I was told there was nothing. Please see notes below as I have documented every occurrence and can provide maintenance documentation too.

The car shakes when going at speeds as low as 48 mph and as high as 68 mph that I know of. Typically, it shakes heaviest from the mid-50 mph range to the mid-60 mph range. I rarely Drive the full speed limit for energy conservation reasons, so I cannot tell you how much higher it goes on the range. The car has had the wheels rebalanced three times (installation, upon purchase from the dealer and on a take back to the dealership), the alignment has been checked twice and I have spoken to the tire manufacturer about the tires being the cause of this. I took the tires into an authorized retailer to no avail. With everything checked, including a road force balancing of the tires, my 4Runner still shakes disturbingly. I called a service advisor at another Toyota dealership today (they were not the seller). In describing the problem to him, he cut me off and said it is a known problem. He went on to share that the dealership had been in contact with Toyota Corporate. It is disturbing for me as a driver, my passengers and from an engineering standpoint; shaking can never be good. It could easily cause premature and unnecessary wear to drive, suspension and steering parts. It could lead to a serious and fatal accident over time. The shaking, I imagine, could also lead to a problem in less than ideal driving conditions such as rain, snow or ice as well.