Vibration with Ridge Grapplers stock truck

Put stock size Ridge Grapplers (26570R16) C rated, on 2018 LWB Off Road 4x4, stock alloy wheels, 38k miles. Rode great for almost 1k miles then developed a vibration in rear at around 40 mph. Back to tire store and had rebalanced. Same thing. Rotated, same thing. Then a steering wheel shake developed at 60 mph and up. Re-balanced. No change. REPLACED THE TIRES with a new set (same Grapplers), no change. Took truck to another shop to check balance. Out of balance. Did a static balance on it. Same results.
Shop is going to mount a different set of stock wheels and street tires to see if they solves the issue. Other option is to Road Force balance.
Has anyone had an issue with Ridge Grapplers not riding well on a Tacoma? I now have 44k miles on the truck. Hard to believe there would be a drive train issue. Possible?

 

Should have road forced balanced from the get go. I’d start there.

 

I had very similar problem. I went with 265/75/16 ridge grapplers and had a strange vibration around 40 mph. It didn’t feel like tire balance issue. More like the shaft or axle were skipping. Had the tires balanced again and shop said their machine wasn’t calibrated but the rep was there and calibrated their machine and they rebalanced my tires again. Vibration did not go away. The manager took my truck for a drive and agreed with me. I switched to the new Toyo AT3 and issue went away. I was bummed because I really wanted the ridge grapplers but couldn’t live with that vibration.

 

Update: Less than 1k miles on new set and found cupping on the outside of rear tires. Went ahead and had them road force balanced but vibration is still there. Shop recommended alignment check and/or suspension. Would bad shocks cause cupping on the rear tires? Only load I have is a camper shell and sometimes pull a 6x12 trailer with a couple of kayaks on the weekend. I would expect more than 40k miles out of stock Bilsteins.

 

You don't have bad shocks or suspension with that low of mileage. I would have it aligned properly and enjoy the truck. Keep in mind you have aggressive tires that will take a while to break in. Be prepared for 10000 miles at least for break in. Make sure they are inflated properly. I run 36 front and 34 rear.