So we were up in New Jersey last week, and the car makes some weird noise like a hum, from the front end, with that distinct "airy" reverberation... that sounds like tires, but I wouldn't think that, as they only have 1.5K on them. And I have heard that it could be either wheel bearings or something with the calipers, and this has to be fixed TOMORROW as we leave for another trip (to PA) on Sunday. Please help!!!!! I don't want to be stranded on a trip that I don't want to take, and esp. with other kids with us (scout camp... have to haul scouts and the trailer) The truck is a 2003 Chevrolet Suburban LT 5.3, with 91k MI.