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How many bikes?
How heavy are they?
Fitted direct to the rear bumper?
Never had personal experience but a lot of people suggest NOT to put the bikes on the rear end due to bouncing around (Leverage issue) and others have lost theirs on their travels and knew nothing of it until they stopped somewhere
Some have done it without any issues so guessing it all depends on how it is mounted and strengthened????
If you scroll down the page there are a list of "Similar Threads". One of them may be of help to you
@Rick ?
Otherwise someone with experience in these will pop in and answer your questions for you!