I have an 8' x 12' Wells Cargo ME Series (featured with my Navigator on their website BTW)
http://wellscargo.com/wellscargo-trailers/motorcycle-trailers/me-series/overview/with 2 wheel dock chalks installed. Been using this setup for years hauling numerous times to the west coast on Canada and the U.S. with trips to Texas, Arizona and Florida. I recently traded my Navigator in with just over 200,000k's on the dial and most likely over 125,000k's of that was from my hauling the bikes around.
It takes me less than 10 minutes to load to Ultras complete with tie downs. I use a total of 3 tie downs per bike... One through the front wheel as they suggest on their website, and one each from the frame just in front of the saddlebags on either side.
The bikes are very secure and I have never had any concerns with this system. Can't say enough about wheel dock chalks, they're the best! One of the best things about them is that I no longer need the wife to hold the bikes up while I tie them down as the chalk does it for me once I have released the lever and the front wheel is locked in.
I wish I had pics of our bikes loaded to share ready to roll, but will have to work on that. Sorry.