Keith,
I am not sure how your PT differs from my Patriot Savannah, but I do know that they do have several differences.
That being said when changing my air bags, I did have a concrete pad, and made ramps to raise the tires up another 4 1/2 inches off the concrete. From there with the coach still aired up I wedged in blocks of 6x6 lumber under the rear frames near the air bags and used 2 bottle jacks between the frames on the front. I also added cribbing between the 2 jacks as a safety measure.
From there I could air down the Coach and it was still supported at ride height or a little more. Getting to the air bags can be easy or a real bear! I am sure this would be easier with the wheels and tires off, but it can be done without. The panels covering the airbags will hinge up, but access can still be tight. That and some connections will want to stay connected. Hope this helps you some,