I've never toured with mine but taken very long rides, sometimes with more than 30lbs of stuff, and I'd say it's not the best weight-bearer. (Compared, say, with my wife's Appaloosa, or even an old Crust Bombora we share.) But it's absolutely perfect for road riding in the Bay Area, so if that's the riding he's mostly going to do, I'd go for it. With the right prep (and tires), it won't fail the tour it'll just be kind of OK, at least going by my experience. The HH is no wimp, and I think you should buy a bike that works for 90 percent of your riding, and figure out the rest.
(Although: it's no tank, either, so how much over 30lbs does matter.)