I bought a Piggy Backer trailer for around 400 bucks. Picked it up at their company in Easley, SC and towed it home. I extended the tongue 11 inches, and it pulled great. Took it on several trips to Ohio, Arkansas, and once to Niagra Falls, NY. Haven't used it since I bought the C14 in June of 2010. BECAUSE I CAN'T FIND A DECENT PRICE ON A SIMPLE HITCH!!! (sorry). They don't offer the model I have now, which had 8" wheels and a straight axle with leaf springs. They still sell their "XL" model with 12" wheels and independent torsion bar suspension for under $1000. Since I got mine, they even include a swivel hitch, something mine lacks and will need to be added before I put it behind the Kawi.
In fact, if I ever find a good hitch for the bike, I'm thinking about re-modeling the trailer. I think I'd like to eliminate the "cooler box" on the front, and remove the big square cargo box, and replace it with a longer, slimmer, car top carrier from Yakima or Thule. Might even cut down the width and pull the wheels in closer to make it more streamlined. I'm sure when I get done, I'll have spent more than it would have cost me to buy a nice factory trailer, but mine would be mine!
Here is a small pic...