That is how my Yanmar is set up. I dont know how it plumbed in. Went we went to buy it, we also bought a tipping trailer. We asked the dealer at a rear hydraulic port (just one). To use the trailer, we use the 3pt control, when the 3pt gets to the top, the trailer than starts to raise. To hold it in position, just put the 3pt control back to the neutral position, to lower just use as if lowering the 3pt, the trailer drops, then the 3pt.
I havent had a look at how this is set. It is on a Yanmar F18D. I wont be at the tractor for a couple of weeks, but can have a look when i next am if that helps?