Warped Rotors only give vibration when you are applying the brakes. If it is doing it just driving, then a bent wheel can cause it. This is a big problem with aluminum rims. Also...worn bushings are a big cause, even more than ball joints. Take it to the 'recommended best' front end shop in town and have them look at it. Most front end work is best done at the shop, as they will have the proper tools.
PS...if you had the rack put in at a front end shop, they should have checked everything out while it was there, and fixed it, because they are there to make $$$, and make YOU a happy customer.
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