I guess I said I would update you on how the ol' Univega did.
I am REALLY glad I did not ride the Roubaix. I am not certain the problem would have been the frame, the index shifters, the spoke pattern on the wheels, or some other aspect of the bike that makes it really fun to ride on day trips. The problem would have been in the 2-ring cranks. This could have been changed before leaving, of course, but whenever you have the option on a tour, the 3-ring cranks are necessary (though I did many tours on a 2-ring crank PX-10 years ago, when I was just a tad bit younger). I used each and every one of the available gears on the trip from Portland back to North Dakota last month.
Other than that (and the need to buy one of the fine Brooks B-17 saddles from the Rivendell folks before my next trip), the classic steel Univega did a superb job.
And by the way, except for some very hard days across Eastern Montana, it was a real joy to be back on the road on a bike tour. It had been way too long since I had done the last one....