vibration

I have a new Kubota MX6000 with rear loaded R14 tires. When driving on a hard surface like a driveway or road the tractor vibrates quite badly. I did have the rear tires set in their widest position if that makes a difference I don't know. When using tractor on the field no problem. Is this...

In many, many other threads, when someone mentions the need to get a flail mower rotor balanced due to vibration, the response is typically "find a reputable driveline shop and they'll fix you up." I've called all of the reputable driveline shops within 2 hrs. and they all stated they can only...