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Prowler - I'm jealous since the GAP and C&O are on my bucket list. I love your set up with the Cannondales. Best of luck on your trip and may it lead you to many more. You have me by 2 years and I give you credit for maintaining the down tube shifters. I've gone to barcons because I just don't like the reach anymore on a loaded bike.
I have a twin to your Voyageur and it has a wonderful ride. It has served me well on a 5 day tour in western WI and touring around Austria.