Vibration?

I had a same problem on t2000 check your motor mounts

 

New vibration. I have Volvo vnl 2011. Okay the vibration is coming from under the truck but the somewhere in the rear maybe my steer feels like loose or something is loose down in the steering axle. I have new leafaprings, allignment. Today i just install new tires, thought might be from there because they were bad anyways. Same thing with the new tires, but when the guy pulled all the wheels from the truck on the rear axle left whee was kind of loose was going left and right and hit the drum. I checked the others none had that play with the drum. Vibration under 55 to 60. If im bobtail you dont feel that much, when loaded you hear the noise brrrr. I hate this small vibration that can cost up to 5k