2012 humming sound at variable speeds

My 2012 V6 started humming at certain speeds about 3 months ago. Starts at 35 mph and goes away then comes back at 70 mph and goes away at 80. It’s a slight hum/ vibration that seems to come from the rear right. I checked for play with the wheel bearings and they felt solid but from what I read online, someone else had the same problem and new bearings solved it. I am installing new bearings this weekend, hopefully it will solve the problem. Has anyone else experienced this before? If the bearings don’t work where else should I look? Thanks!