I took my Roubaix for an 11 day, 1100 mile (~1770 km) ride down the coast a couple of years ago. We only carried water, our wallets and basic tools. But we had a chase vehicle that we met up with every 20 miles or so for fresh water, food, supplies, etc. So if you have that luxury, I'd say no problem at all. If you don't have a chase car, just make sure you have enough supplies for the route you're taking. Needing something and having no means to acquire it is not a good situation.