If you really are going to be doing a lot of rough roads, consider weighing the cost of stuff like that^ or of damaging your nice bikes, against just buying yourself a couple of old mountain bikes for $200-300 each and equipping them with cheap bags and panniers and camping gear, and leaving the road bikes at home.
I know that wasn't your question, but I see few reasons in the OP that say that your touring needs to be done with the fastest, lightest bikes you have (do you have difficult time/distance constraints?) and many reasons to go with a tool more specific to the job.
I've found that I dislike trying to multitask with road bikes- taking on and off racks and mudguards and big lights and swapping wheels and tires so I could tour one weekend and road ride the next? It sucks. Plus I'm no good at packing light. When I bought myself a carbon bike, I made sure it was impossible to mount a rack on it (because I knew if it would, eventually I'd do it).