I own several road bikes and considered seriously about using one on my recent cross country trip. I finally decided to purchase a touring bike and used a rear rack. I am really glad I made that decision due to the comfortable ride it garnered. Other advantages include slighter wider tires (28mm), relaxed geometry for those 6 to 8 hours days, MTB cogset for climbing mountains (Appalachians, Rockies, etc. while carrying a load and road bike brakes/shifters, and comfort and durability over bumpy roads. I went with a steel frame which helped ease the harshness of the ride. On the down side, the bike slowed me down about 3 MPH on the flats. 4200 miles of riding pleasure without any mechanical issues. Changed brake pads once, and tires once.