Rear vibration at 60+ mph

[tdm571]

When I go over 60 mph, I am feeling a vibration in the rear wheels. Everything I've seen like this talks about a vibration in the front wheels and the problem being tie rod ends.

 

[SlowNA06]

Rotate wheels. See if vibration moves. Would indicate improperly balanced wheel. Make sure to clean rust off wheel and bearing surfaces to ensure tight fit. Inspect tires for bald spots.
Bent rear trailing arms?
Warped rotor?

 

[tdm571]

Rotate wheels. See if vibration moves. Would indicate improperly balanced wheel. Make sure to clean rust off wheel and bearing surfaces to ensure tight fit. Inspect tires for bald spots.
Bent rear trailing arms?
Warped rotor?

I am due for a tire rotation/balance. Wheel bearings and rotors are brand new, so I doubt that would be the case. I checked out the trailing arms. If they are bent, it isn't visible to the naked eye.

 

[Odi]

id get new trailing arms anyways if theyre stock. ive bent mine with my sissy little arms. thats how ****ty they are. other than that, check the tires/wheels first.