For what it's worth, I just got back from using
this pulley to install my MCS. I think with practice this could make things much easier for me, but it will always be more of a feat of strength than a 3PH mounted one - especially with Pat's EZ-Hitch installed. Things to note:
I mounted it where I keep the MCS, you may be able to mount it on the ROPS but I don't know how difficult that would make installing the MCS because the pulley would be pulling the MCS forward whereas mine pulled nearly straight up.
The MCS is very lopsided from a weight distribution standpoint so make sure you mount the pulley over the center of mass of the MCS and not the center of the tractor.
I keep my tractor inside and I can just barely force the ROPS up in there (not an issue with a 2305 unless you have the aftermarket folding ROPS). If the ROPS is folded mounting the MCS is not likely to work for you, and even less likely if you're suspending it from ropes.
While the pulley is, shall we say, appropriately priced at $10 and I have no idea who would use it to lift 2000lbs, when I used it the MCS is easy enough to raise or lower with one hand while I guide it into place with the other. I bought four
tow hooks to grab onto the MCS with - while they're overkill from a capacity standpoint they are able to grab onto the frame fairly well.
I never liked the tow-behind collection systems, and I'd prefer the 3PH hydraulic system but it's too big for the 2520 (officially, it apparently can work but you should have front weights installed). Of course, the ideal solution is to have a dedicated mowing tractor and just leave the system installed, but it's too late for that for me
Hope this helps!