I have to say, while it looks good, I see a potential problem.
When you attach the chains that far back, the actual chain has to be pretty long to allow you to turn without pulling them tight.
If you ever have the trailer pop off the towball, either by forgetting to do it up or by a mechanical failure, the long chains allow the trailer tongue to hit the road.
I actually saw this happen last Tuesday while driving behind a guy with a load of firewood. We were driving through Latrobe and the trailer bounced over a section of roadworks and came off the towball. The tongue hit the ground, slid a bit while thrashing backwards and forwards and then dug in. He only had a single chain and it tore off on the trailer end. The trailer stopped almost instantly as it was loaded front-heavy and was plowing along a section of packed dirt where they were preparing to bitumen. We were only doing 50, but had it been faster or on a proper sealed road, the trailer could have gone anywhere.
Greg.