I have 28 spoke Mavic CXP33s on my road bike, which I have taken a couple 40mi rides with ~30lbs on a light rear rack, and they're still straight as can be. I don't know that I'd want to rely on them for out-of-country, far-from-home with possibly a little more weight. I was riding pretty well maintained rail trails. They're also not as wide as I'd want for a touring rim. I think they recommend running up to 700x28c tires or something like that. I think I'm gonna run 38s.

Still looking for a place to get cheap Dyads. I found down to ~$55 on ebay. Black strongly preferred, but not a must. If anyone knows of anywhere...