Are these the original tires that were on the truck when new? Have you tried rotating the spare into the mix. Spare tires can be deformed in the spare rack. BFG Long Trails run at a fairly low noise level. I moved to BFG AT KO ‘Tri Guard’ one size larger. The over all noise increased a little but worth it for running on sharp rocks in the Colorado Mountains.

    There is a rare condition were a tire can be slightly out of round yet balance good. BUT it will become noisy and a little unbalanced at speeds below 40mph. Also hidden tread separation is a possible cause.

Good Luck.. Don S..