CJL42

Is anyone out there using a trunk/hatch mounted bike rack? Want to get a 2 or 3 bike rack and the guys at REI claimed a trunk/hatch mounted rack is not recommened for the Journey and that we should be looking at either roof or hitch mounted. Either one of these is going to be a $400+ option (Thule/Yakima etc.). I have an R/T with the factory fit siderails. Any help or suggestions appreciated.