Originally Posted by
bloom87
I guess my question is more of a physics question : if I were to add a tube to make the bike more stable with rear rack loads, what would that tube be ? double top tube maybe ? like Mexican/3rd world type bikes ?
Having a double top tube would not make the bike significantly stronger for carrying heavy loads.
How heavy do you you expect the loads to be?
Why don't you make your own rack. You could make it larger than one you buy off the shelf. Keep weight in mind. If it is really good, but too heavy, you wont want to use it long.