I'm looking at these two products to haul my GS 1200 around. The DW got a 2013 38RSSB3 on the grounds that I get to take my ride with me.
http://www.idahotote.com
http://blueox.com/c-46-decks.aspx
Seems there are few options. Don't know if I should just go to a metal shop and have someone fabricate one for me. Still thinking it over. If you find / hear of other products, let me know.