Mike I still have some ideas to help make it stronger. The wood on a 1:1 is slightly raised so your not loading on the slick metal surface and with my new idea to strengthen the trailer the wood deck should be just a little taller than the frame.
Here is a pic of the trailer I am kinda going off of and you can see the deck boards in the pic sit a little higher than the frame. I chose this trailer because we have one at work.
Thanks for looking
Travis