You don't want to go to Killington for the Harley parade (unless you like POTATO-POTATO x 100 and the smell of unburnt gasoline and burned oil) , or the vendor booths with Harley brick-a-brack, or the poseur boys with straight pipes and no sense.
Went last year, stayed at the Swiss Farm Inn (great folks, cheap rooms, big breakfast, good dinner included for a nominal charge, coffee's always on), and rode Route 100 from the bottom to the top. It sure was funny to be on that road & not have 6 inches of snow on the ground... Rte 100 is a great bike road, straights, curves, tight curves, and the occasional Volvo or Subaru that acts as a throttle retarder. Wonderful country to ride through & friendly people too (almost as friendly as the Canadians). It's almost too good, the kind of area where there is no wrong turn, just lots & lots of good riding roads.
There was an 1150RT, my FJR, and a big Harley in our threesome & the Harley was definitely the limiting factor in the ride. Nice guy & all, very experienced long time rider, but boy he seemed slow ( or maybe I'm so used to the FJR that anything less than warp speed seems like standing still).