I did alot of research on this very subject and I can tell you they work great but there is nothing out there for a Harley. EZ-GO and Club Car have most of the accesories available with Yamaha have some also but more expensive. I just bought an 2001 EZ-GO and used it this deer season it works great and goes damn near anywhere I was really surprized were it would go. There are alot of differnt models available in all models so becarefull before you buy. Feel free to shoot me and e-mail and ask any questions. Also check out this web site they have a forum with a bunch of good guys on there and also sell everything you could think of for them.
www.buggiesunlimited.com
I will try to post a pick of mine so you get an Idea of what you can do to them also check out ebay but I wouldnt buy of of it yet just use it for research.
Eric
I forgot to mention they are about 1/2 the price of a four wheeler after all the mods and can haul 4 adults. What a plus.