If you are looking for independent reference points as to how much a V twin can move in a frame, check out HD Electraglides which are rubber mounted compared to a HD Softail eg Fatboy which are solid mounted to the frame. Same engine, just different mounting methods and the rubber mounted engines really rock in the frame but pass little of the vibes through the frame, whilst the softails don't rock anywhere near as much but do pass the engine vibrations through the frame and handlebars.
