It can be a balance issue. Just because one shop supposedly 'balanced' your tires, doesn't mean they did a good job.
Find someplace that has the Hunter GSP 9700 Road Force Balancer, AND KNOWS HOW TO USE IT. I can't tell you how many times I've been to Tire Shop's, and they had that particular balancer, but no one on staff that knows how to use it's full capabilities.
The bottom line is that it can determine if there is a tire with a uniformity problem. Or if a wheel has excessive run-out.
I wish this weren't true, but it is and, apparently, always will be.
A good balance can be achieved without that monstrosity of a balancer. I do agree many places don't know how to use it or what the purpose of a diagnostic balancer is. He want to Sam's club, how qualified do you think the tire changer is there?
All you guys tell the OP to find a place to rebalnace the wheels.
I OWN a 14 year old tire changer and wheel balancing machine.
Lets get back to basics first.
-wheels could be bent
-tire could be mounted on the wheel wrong and NOT seated correctly. and not centered. thus when the tire spins it will be out of round. this will balance out with weights. still the tire is out of round.
- once its mounted improperly. its hard to fix this problem.
I own a cheetah for a reason.
If you look at my tire and wheel in the above picture. its a 9" wheel and a 295 tire. very hard to make a seal so the tire can bead. if i tried to seat the tire like that vertically it will seat more towards the bottom. thus when the tire spins on the tire machine, it will hop up and down. thus out of round.
it will balance, but driving down the road it will vibrate at speed.
how the cheetah comes into play? i lube the tire with tons of bead butter and lay it horizontally. i use the cheetah to set the tire and no out of round tires.
I would watch the mechanic that does the balancing. see if it is out of round or bent.
I would not say the tech didnt know what he doing. its a simple machine. stick the tire on and spin it. stick weights on and done when you get 0.00 across the board.