I just purchased a used 14 ft open trailer with tandem axles. I was putting air in the tires today and noticed that they all wobble a bit. If I push in on the tops of the tires, they seem to move 1/4 inch or so. Bolts seem to be on nice and tight. Just so you know, one of the tires is 1 size smaller than the rest, but they still all wobble. Whats up?