Hi Seaotter,
I'm with 2'air on this one... If you plan to travel more, and want the "spend more time traveling and i want to have the best ride/tow" as you say, the first question I have is what tow vehicle do you plan to use. This is going to be a factor.
If you still use the QX56, then the hitch would not be my focal point, but the durability / strength of that vehicle as your tow vehicle. I think with that much weight and tongue weight, the weakest point of your setup will be the hitch. I think you are exceeding the "as designed" and "as tested" capabilities of the QX's hitch. You then create a whole new "weakest link" with this setup, but, as 2'air pointed out, that is a subject of a whole other thread... Don't get me wrong, I'm not picking on the tow vehicle, I towed my 28' Safari with it for a short while... (emphasis on short).
The reason I bring up the question on your tow vehicle is that I hope you do look at a different tow vehicle setup for your "more time traveling" and "best ride/tow".... The QX would not be the "best" with your trailer, but dangerous.
If you do look at Hensley or Pro Pride, do keep in mind that currently neither of them have the available "10 inch drop shank" that you might need with a different tow vehicle, such as the 2008 Ford Super Duties or 2008 Suburban / Tahoe / Yukon / Denali.
Using Hensley Hitch with 2007 Tahoe In Bumper Receiver
My understanding is that Hensley is supposedly going to a "major redesign" after 15 years, of which we hope one design factor will address taller hitches on newer vehcles... (eta TBD)
My understanding is that Pro Pride also does not have the shank available as of yet, but will be soon (ETA a few months away per Sean).
This may or may not be a factor to you, as I believe you have a 19.75 hitch height on your trailer, so you may be able to get by with the available 8' shank max shank currently available from both hitch manufactures.
Just keep the choice of vehicle in mind as you consider the Hensley or Pro Pride.