Safest way to carry luggage on my carbon frame? I'm planning a 5 day trip on my Trek Madone 4.5. We are planning on staying motels so don't need to carry camping equipment. I need to find some type of rack that is compatible with my carbon frame - I would prefer a rack that could carry more than a seat post rack ( seat post is carbon) 

I would welcome any suggestions - since this is a one off trip I would prefer not to buy a new bike.
The safest way to carry luggage on a carbon frame is to use a trailer, like the BOB trailers. 



Carbon frames are very strong, but each area of the frame is designed and tested for the loads it expects from a given direction. Adding luggage to a frame not designed for it, i.e. Without braze-one or threaded mounts, is generally a bad idea.