Two different Subaru dealership repair shops told me that i have loose rear wheel bearings on my 2003 Outback. My car does sound like a VERY loud airplane all the time now, but the noise is the only symptom i have noticed. My shop has told me that they will fix it for a discounted price, but they are not pushing me to get it fixed, and have told me that it shouldn't cause any actual problems besides the loud noise being very annoying. All internet research to the contrary, though. I have to drive about 1000 miles round trip next month -- is it just going to be a noisy trip, or is something horrible going to happen if i don't get the bearings taken care of?