Vibration at 65mph+ - back left shaking/pax seat shaking

Feb 20 bought Tacoma off-road
Spring 21 added icon stage 2 suspension
Summer 21 drove Sacramento to Albuquerque. Drove back a car trailer
Spring 22 added method wheels to stock
Prob in there started to notice shaking pax seat at higher speeds (65mph+). drive that speed often and was fairly intermittent worse on concrete vs pavement.
Then hit Americas tire for Balancing and rotation didn’t change issue
Fall 23 changed to bfg ko2s onto methods and it’s worse.
Recently used side view and could see it visibly shaking at 65mph+ but couldn’t tell
If pax tire also shakes
Had tires rebalanced and rotated and still same

Unsure if Americas tire uses a road force balancer but Toyota wants $350 for that.

Asked Toyota to check hubs/bearings/drivetrain before balancing and says all ok (altho I dont trust they did) and feels it’s the susp kit or wheels/tires.

They asked me to take it back to lift installer to verify all
Ok.

They also said if it’s not the lift they would want the stock suspensions wheels and tires out back in to assess further!!!!

Has anyone else had back wheel shaking from icon susp/lift kits?

 

Pax?

Have you have the suspension hardware retorqued?
The wheels are not flat spotted, bent?

 

is there a way for you to try stock tires and wheels to see if the vibration goes away? that would at least narrow down the cause to being tires/wheels, or the lift or something else.

 

What are the spec of the Method wheels? Toyota spec hubcentric wheels.

 

Sorry pax = passenger

 

Method MR701 is the wheel

 

Good idea - I still have a stock spare but not a full set.

 

no on the re-torque. Thought Icon 2 were maint-free

 

method MR701. I hear they are lug centric

 

My pax seat shook when my truck was stock new off the lot. Just has a lot of play with nobody sitting in it

 

Same. It’s been discussed here before. Seems to be normal. When I do have a passenger in the front seat they have never complained or mentioned it.