As long as you guys aren't death marching it, you'll be fine. I'd do it in a heartbeat, and provided your using secondary roads, it would be awesome. A REALLY good seat, luggage rack / tail bag, maybe a GPS if none of the others have one, and you're all set. I've done right at 400 miles in a day no problem, and that was hard riding. The only thing that sucks on longer trips is getting blasted by the wind the whole time. But if you're riding twisty stuff the whole time, it won't be an issue.