I heard somewhere that it says in the Goldwing manual that hauling a trailer is not recommended, but you see how many of them there are, color coordinated even.
When I was a yonker I new a guy that hauled a trailer with him and his wife all over the place, with a 400 something. I just got a Harbor Freight trailer kit to put together to haul with my 900. I have another acquaintance on the internet that has the same setup and has no problems.
THIS is the link to the Delphi Motorcycle Trailer Towing forum. You can ask a number of folks with your size ride questions about what your experience will be. I may need to run 55 instead of 70 down the interstate, I may ONLY be able to do 55 instead but from what I've been told with MY setup, the biggest problem I'll have is forgetting that it's back there.