I'm in Garelochhead, don't know if you know it, 8 miles from Helensburgh. The A817 Haul road, which runs from Loch Lomond Golf club to Garelochhead is a good road, I used to regularly throw my bike along it. The Garelochhead to Arrochar road (A814) is the bouncy bumpy road that Top Gear used. Take it you have a couple of Maserati's?