Well we have a few boss V-plows, 9'2" VXT poly and they are very heavy. We recently got rid of 2 that were on skid steers cause they just not fast enough. But I still have one on my T190 and I have the 7 pin attachment control, and 2500HD. My dad has 7 trucks and all have boss v plows Very nice plows. But I Never seen them on a tractor loader though.
Now I have seen them frame mounted (no loader) on deeres 4x20 series and they had them set up two ways. Run the full headgear lights pump and set up with the controller inside the cab, now the second way was to use the loader hydraulics but use just the blade no lights no pump and have the raise lower, dump curl, and the 3rd.
But say you did run it on the loader I would get a valve from grouser and it is a basic toggle switch that's a diverter valve right on the plow and still just use your 3rd function. Why run all the extra hydraulics when you can run just a valve on the plow, really it's the same as hooking up a grapple but you just have to plug in a wire.