If you have belted tires I expect that it is your problem. I have 12 inch and they put five sets of tires on mine before it was somewhat ok. I am still not happy but am tired of complaining. If the tires are belted, they are shipped folded over and tied down which stretches the belts and throws them out of round. The dealer knows this but won't tell you unless you confront them about it. If you jack the car up and spin the wheel you should be able to see which ones are out of round. The last set they put on mine the mechanic spun 42 wheels and tires to get four that were somewhat ok. It did get a bit better after 1000 miles.
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