My Land pride QH-15 Quick Hitch was delivered today - along with a new Land Pride RB1560 rear blade. My first adventure with a Quick Hitch. I was anxious to install it on my 2720. What a disaster! The QH15 married up to the tractor just fine but I cannot get it to grab the RB1560 to save my sole! Normally, mounting the blade to the 3PT takes about 5-10 mins. Using the Quick Hitch was a two-man 30-min job with a lot of fowl language being thrown around. First, the lift arm bushings that Land Pride sends with the QH15 are worthless for regular implements. They are straight walled bushings and only 1.5" long so they just float around on the 3PT pins. The second problem is I had a terrible time getting the top hook to fit between the blade housing and grab the top pin. It keeps getting snagged on the sides and that just throws off the lower connections. It's almost as if the top part had insufficient clearance. It WILL fit but only when carefully guided by hand. Oh, and then when you do get it inserted it comes into contact with the hairpin clips that holds the hook in place and sends the hairpin shooting across the driveway.
I intend to stop by TSC and pick up a pair of "normal" lift arm bushings but what about the top link bushing? Is one required? It looks like the hook expects a larger diameter than the normal top-link pin. The manual really doesn't mention it. All the places that sell Quick Hitch bushings normally only show the two lift arm bushings. Rarely any mention of a top-link bushing.
I keep asking myself, is it supposed to be this difficult? 
If the new land Pride Quick Hitch has trouble with the new Land Pride blade, what hope to I have for my other implements.
I'm going to tackle it again over the weekend once I have a real set of lift arm bushings and have had a chance to clear my mind. I doubt though it will help the issue of my hook snagging the sides when trying to get at the top-link pin.
Any words of wisdom? I will post some photos if I continue to run into problems.