Usually when the bearings start to go bad you may hear a clicking sound when you back up the bike. Jack up the rear or the bike and see if there is any side by side play in the rear wheel. Also see if there is any side by side play in the rear pulley. My other suggestion is that the disc brake pads are vibrating so if you pull the back pads and put disc brake lube on the back of the pads it may cure your problem.
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08 FLTR candy red sunglo,with 2015 103 HO, V&H Dresser Duals with Monster Rounds, Power Vision tuner, Willy Shiny Wheels and Forks and a bunch of other stuff.