Low humming at low speed

[Cjbaron1976]

On our recent road trip I noticed the rear of the vehicle making a low humming sound when driving between 10 and 40 k/hr. Once the speed hit over 40 k/hr it disappeared/stopped. I was thinking this would be a wheel bearing, but wouldn't it get louder with the speed increasing. We were driving down a very steep highway @130k/hr (8% downgrade for 14 km) when a shimmy started when applying the breaks. Not sure if the two sounds/actions are related. Any insight before I bring her into the dealership for diagnostics?

 

[MelsRegal]

you are sure it wasnt the road surface causing the issue?
did it reoccur anywhere else?

 

[Cjbaron1976]

you are sure it wasnt the road surface causing the issue?
did it reoccur anywhere else?

No....we noticed it while on holidays and it's been the same ever since. We get while driving on fresh asphalt and well worn roads.