Last pic,
Top view, the bar rest's on the hing keeping it from sliding left.
I chose this fix for a couple reasons...
1. I could not put a bolt right where the hinge is, the wood deck is in the way.
2. I wanted a way to get the gate off without tools, or having to get under the trailer to find the bolt head to take it out. With this bar, I can just flip it 180* to get it out of the way.
3. I could not easily see how to manipulate the gas shocks to have the gate "pushed" right. Mine are perfectly vertical now, so I do not think the shocks were pushing the gate left. Moving one shock mounting stud to angle the shock would not work in my case, the shock body would hit the bracket.
I hope this helps some, the pics are not the best, please let me know if I can help more...