Actually it seems like a splendid idea to make a vertical splitter trailer. Then you can install the pump up front and run hardline to the back with some sort of a quick disconnect fitting waiting there. Then just plug it up and run it. Similar to the way hydraulic snow plow blades work. I think that is actually the smartest way. The only issue will be permanently mounting the tank somewhere because I am guessing that you would need it to be on the tractor at all times or else the pump would run dry when you are just mowing. Also having the splitter on the back means no more smelling the stinky exhaust.