I don't carry any bikes on the back, but since DS is a mountain bike racer I have spent years checking out all the other guys bikes on the road.
In many situations the bikes bounce and sway a lot more than you might realize. Therefore, if you decide to carry bikes back there I recommend that you have someone follow you once so you get a first hand report of what happens on the bounces. Sometimes a few bungee cords can be used to stabilize things.
Be aware that the factory hitch receiver is very likely limite to 100 pounds for both the rack and the cargo. A downhill triple clamp bike is around 45 pounds. Other bikes weigh a lot less. Also, I would not be comfortable with a $5,000.00 racing bike back where I can not see it.
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