We have both a toad and bicycles.
When we bring the tow & bikes together, our bikes go on the back of the tow vehicle. It is nice to have it this way for us because most often we need to drive to a point for the day, then "bike" from there.
An unrealated comment. Look closely at our setup in the picture below. Note the tow bar is not horizontal. This picture was taken before I fixed the tow-vehicle-bucking I discussed HERE
. If you have a comment or question on tow-vehicle-bucking, please do so in that discussion, not here so we don't veer off this subject matter. It just seemed right to point it out since this is a good picture of the bad condition.