Just go to Bunnings and buy some threaded bar; eg https://www.bunnings.com.au/macsim-2...d-rod_p2410340
2 screw on eye-lets IMG_0635.JPG, 2 ratchet straps (unless you already have them), and some (flush-mount anchors from SCA http://www.supercheapauto.com.au/Pro...e-Mount/386107)

Weld one eye-let on one end of bar,after measuring the correct length of threaded bar needed to go through your rear axle.
Slide threaded bar through axle, then screw on the other eye-let , then using your anchor points, ratchet down the ass end of ya bike.
No other restrain system needed.
It's strong, cheap, and easy to use. ;-)

IMG_0636.JPG