250honda

I've had my 2014 cc sb 4x4 LTZ z71 5.3 for 3500 miles now and had not had any vibrations until now I drive the same hyway every day and now when driving 69-78 the passenger seat looks like it's throwing a tantrum or something . Crazy ,one day no vibration now feels like my f250 with a lift and 38 mudders on it going down the road ,I'm going to take to dealer this coming week and hope its a bad tire