ANSWER: Our double motorcycle carrier does not have a towing feature at all.
We have 2 single models that have towing features. One is the VH-55 RO that has a 500 lbs carrying capacity and the VH-SPORT Ro that has a 600lbs carrying capacity.
You will not want to exceed the carrying capacity of the carrier. If your bike weighs 300 lbs and you purchase the VH-55 RO then you would have 200lbs of tongue weight remaining behind the carrier for your trailer.