LB-
Yes, what I am saying is that one cannot use a front and rear attachment at once--unless you are willing to turn the hydraulic diverter valve each time you wish to do so. For example, if you have a front mount blade you can have a tiller in back. If you wish to use the front blade, you would have to "lock" the tiller in the up position and divert the hydraulic flow to the front. Your two levers on the console for the hydraulics would then control angling and lifting of the front blade. If you wish to use the tiller, you would then have to lock the front blade up by turning the diverter value and then you could lift the tiller. So yes, you can MOUNT two attachments at once, but you could not necessarily operate two attachments at once. This is the weak point of these tractors (in my opinion about the only one). Now if you wished to operate two attachments at once, you could do so, you would just have to stop every time and turn the valve which is mounted under the left footrest. As for the hitch, I call the "alpha" hitch an "A" hitch for short. It is just about useless and in my opinion going with the small I match is the way to go. Hopefully this clears up any confusion.
Skidoo- I might recommend loading your rear tires if not done already. It makes a huge difference in traction. Those tires will hold 10-15 gallons of ballast per tire, which would equate to 100-150 pounds of ballast per tire. With the HDAP tires, it really helps. The other thing is that JD generally markedly overinflates the tires from the factory, which means you might not be getting the full footprint on the turf. I recommend checking the pressure and running it at the minimum recommended in the rears. The fronts keep in the middle range. There is no reason to me the 749 should not have fully climbed the hill you posted. Would your 2520 climb it, or is it too steep to try?
John M