Would you know what was good for fully loaded? BF and Brompton have been happily to the ends of the earth under many seats. Not my preference, but your "bold" claim is nonsense. You could even carry 120 pounds with a trailer, or probably on the frame with an added module. If you buy a "folding bike" (which a new world tourist really isn't anyway) that isn't designed for touring you get what you pay for.