I occasionally get a low thumping, like a light pulsating in my front end of my rav4 when I get up to 55-65 mph. I feel this pulsating in the pedals, but nothing in the steering. I'm starting to hear it slightly at lower speeds. It gets to be more prevalent when I make a left turn. I don't always hear or feel this pulsating, but I'd rather replace something that's going out than something that's completely gone. Some others have told me to check my u-joints, but no real advice. I thought it might be my wheel bearings. Anyone got any suggestions?