ANSWER: Yes, you can tow a trailer behind the carrier. If you are towing a trailer with tongue weight then you should not exceed the carrying capacity of the carrier. So if you use the VH-55 RO carrier with a vehicle using a 500 lbs class hitch and your bike weighs 300 lbs and the Versahaul weighs 100 lbs then 100 lbs of tongue weight is remaining to tow a trailer behind the carrier.
Please see www.versahaul.com for other vehicle and hitch limitations that may apply.