I have D rings on my trailer. I use this set up.
I use this there the rack.
<a href="http://www.northerntool.com/webapp/wcs/" target="_blank">http://www.northerntool.com/webapp/wcs/ ... 8659_28659</a>
Then this to strap it to the trailer.
<a href="http://www.northerntool.com/webapp/wcs/" target="_blank">http://www.northerntool.com/webapp/wcs/ ... 1895_21895</a>
With this setup you would have to brake a strap for it to come off.
I use this there the rack.

<a href="http://www.northerntool.com/webapp/wcs/" target="_blank">http://www.northerntool.com/webapp/wcs/ ... 8659_28659</a>
Then this to strap it to the trailer.

<a href="http://www.northerntool.com/webapp/wcs/" target="_blank">http://www.northerntool.com/webapp/wcs/ ... 1895_21895</a>
With this setup you would have to brake a strap for it to come off.