I recently took a tour of Nova Scotia on my Tricross. It was 63 miles of nasty headwinds and crosswinds. The bike was extremely stable. When I was crossing the causeway to Cape Sable Island, the crosswinds were really bad, but the Tricross stayed on course. It was kind of scary especiallly with trying to negotiate the road with cars. The bike stayed on the line I pointed it.
If your 'cross has a long wheelbase and a relaxed geometry, it makes for excellent long rides. I wouldn't hestitate to ride the TriX on centuries and more multiday tours...