I have a noise that increases with road speed and sounds like tire noise. It is loudest around 55mph. Thinking it was my 32x12.50x15 B.F. Goodrich's, I had a set of new Dunlop's put on. Same exact noise. Then I had the tire shop upgrade the tires to 31x11.50x15 Michelins but the same noise exists. I'm losing my mind! Not to mention over $500 in tires! Does anyone else have this problem or have ideas on what to check?

Thanks,
Rick