the griffin road trip will allow you to use a case if you don't use the included inserts, however, the case has to be small enough to be able to set it on the dock and have the dock connector go all the way in. I used it with an incase protective cover just fine. You might have to lean the back of the phone against part of the dash, otherwise, the weight of the iphone will be resting solely on the dock connector.
You might also look at som universal gps mounts. I got one from radio shack that clips onto the window or onto the a/c vent.
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