Doug;I have a Condor wheel chock in a 6x10 enclosed trailer. Here's what works great for me:
Points B & D are actually only about 6" forward of the horizontal line you drew through point A. They are located 56" apart from side to side. I assume your point A is the front tire contact patch. I only partially compress the forks with the front straps (no more than half way).
I actually have 6 tie down rings in my trailer which are laid out like the pockets in a billiard table. I only use the the forward 4 rings to tie down the wing. The middle rings are approximately 46" behind the front rings (B & D) and work great for tying to the frame under the side covers, as shown in the link S&W Winger provided. These two straps to the frame basically carry all of the load. I use Powertye Fat Straps. These things are awesome. http://www.powertye.com/product_info.php?cPath=25&products_id=90. I didn't buy the black and orange set though
I don't bother to tie down in the rear at all. Haven't had a need to. The bike never budges from its original position.
Probably hard to follow without a diagram. PM me if you need further info - maybe I can e-mail a diagram or pic.
Maybe we'll have to get together for a ride some day. Lots of awesome roads in and near your neck of the woods. :thumbup: