You need to understand that the OEM PTO valve is designed primarily to run motors, not cylinders. To equate this to the world of electricity, the PTO is the same as an ON/OFF switch in the bathroom that controls the lights. The travel valve and the lift valve are different. They are designed to "meter" fluid .... slowly at first and then as you push the lever further, the amount of flow increases. This similar to having a dimmer switch on the chandelier in the dining room.
Therefore, you might find it wise to install a separate valve on the splitter you build and then use hoses and couplers to attach that to the OEM PTO valve. That way, you hook up the splitter, open the PTO valve on the tractor and then use the other valve to control the ram while splitting.
The dump trailer is a nice thing to have but once again the PTO valve poses a problem due to being an OFF/ON switch with little to no feathering ability. The second problem is the 2200 PSI setting of the relief valve. That's way too high for the cylinder. To solve the problem you need to install your own relief valve that is fully adjustable from say 300 to 1000 PSI. You would send fluid to the IN port of the relief and the OUT port would feed the bottom of the cylinder. The DUMP port of the relief would Tee into the line leaving the top of the cylinder. In order to control the speed of this cylinder, I would use 1/4" hoses because they deliver 1/4 the amount of oil that a 1/2" hose does. I would set the relief at its lowest point and then fill the trailer up with the heaviest load you ever expect to carry. Then I would try to lift that load. IF it did NOT lift, then I would adjust the relief higher until the load lifted to full height without hesitation.