A good friend and I went in on a trailer last year for the same purpose... we had both been riding to destinations for a while, but decided we both enjoyed the rides at the destinations much more when we towed the bikes up and back.
We went with a landscape-type (6' x 8') trailer to keep costs down, then added wheel chocks from Northern Tool
, and a few eye hooks from the local hardware store.
A few things to consider:
Avoid the trailers with the mini-tires. The full size (15") tires keep the trailer from bouncing around.
Diagonal braces from the side of the trailer to the tongue helps the trailer track better
A built-in ramp makes loading and unloading a whole lot easier... especially if you plan on using it for other things... like riding mowers, etc.
The only photo I can find of mine is from when I picked up my Buell in May, but the 919 fits just fine as well. Crappy cell phone photo, but you can see the wheel chocks, eye hooks and diagonal braces.