You're going to want to use a 'motorcycle wheel chock' installed on the deck. You then install a couple of padeyes forward of the handle bars. The tie down straps shoudl pull the front wheel into the wheel chock. This should keep forward and back motion to a minimum. I would install the same at the back and have four tie down points.
You'll need to make a small block to place between the front tire and the front fork crossbar. When you reef down on the tie downs it will compress the front suspension. The suspension under prolonged load will cause the seals to start to leak. The block prevents the front suspension from overcompressing. Without a solid front end, if the suspension compresses, slack is introduced to the tie downs and the bike fallsover. You'll need to prevent the front end suspension from compressing without putting pressure on the suspension. The block achieves this.
Google the following:
Motorcycle wheel chock
motorcycle fork saver
ratcheting tie downs, not cam-locks. I had a friend almost loose a dinghy when the spring on the cam-lock tiedown rusted and the strap started to slide.
