I have a 2007 GMC Sierra 2500HD C/C with long bed, and also the Curt Q5 hitch. The deciding factor on the Curt hitch was my neighbor. He transports fifth wheels, and he highly recommended it. So I figured if it was good enough for a transporter, it would work for me.
Not really sure which of the three height adjustments to use, or the pin box height on our BC 3250TS, I choose the middle one with the idea of having the folks at RV Capital Service Center making the final adjustment. So happens I was lucky and had it mounted at the correct height.
The teflon plate is great, no messy grease to deal with. I even carry a spare one in case something were to happen to the one I'm using.
I do as pmmjarrett does in his response to question 3. Just don't get in a hurry, and check and recheck each time, and you should have no problems.
Archie