Help....we have a 2012 RT Limited with 13,000 km...it now has a very bad wobble which started around 9,000 km...we have had the tires balanced...the right one had thirteen l/4 oz weights initially...it now has 10...did not solve the wobble problem...which occurs between 65 to 75 km/hr...we then switched the tires from left to right...problem not solved...has been suggested that we get an alignment...could it be a "bad" tire??