I'm not sure whats going on with this thing but when we looked at the car, it had brand new front tires on it. I mean NEW, with the little nipple things still all over the tires. We had to take the car back the other day because there was a shake or shimmy in the steering wheel around 60 mph and also very bad shaking when applying the brakes.
So they machined the front rotors and rebalanced all 4 tires. Drove it around a few days and it seemed fine. Today, we load up the car with luggage, my wife, her parents and myself and hop on the highway to head to Denver for a wedding. As soon as I got up to around 60mph, the wheel starts shaking again!!!

WTF. Once the car gets up past 65-70, it goes away for the most part....
Could they really be that incompetent as far as balancing the tires goes? Is there something else going on such as a bent rim? The tires are crappy but they ARE new. They could be bad I suppose but I would think a spin balance machine would pick up on that AND a bent rim. Just the fact the dealer put new tires on before selling it makes me suspect this problem was there before and they attempted to fix it (or cover it up).
Also, could having a "full house" in the car (trunk packed with luggage, 4 people in car) cause this? As I mentioned above, it seemed alright after the dealer until we left on this trip. Even with a lot of weight lifted off the front wheels due to the load in the car, I don't think it should cause this.....