Hi Paul - I am happy to post a picture of my trailer attached to the QR skewer. I am out on the rode today and tomorrow, but I should be home (where the trailer is) on Thursday. I hope that is not too late.
I too, purchased my 'cotter pins' at Home Depot. I recommend stainless steal. I keep the pins attached to the trailer with a lanyard and always carry a spare set while on tour.
No rush, I'm just working on getting everything back into good working order. I think the straight pin portion of the pin goes into the hole in the fork and that is what hold everything together. Thanks!