I bought my towing stuff from Openroadoutfitters. I really like the hidden hitch. All chrome with a removable ball assembly. All that remains is a small chrome strip just below fender lip in back. Check out their website. THey were good to deal with too? They know motorcycle trailering. And the trailer tows great.
I've used a Dauntless Hitch on my last two bikes. Currently have one on my /09 Ultra. Easiest hitch to install that I've come across and I've installed several hitches over the years. Well made and looks good.