Richard,
I did this to my Patriot about 3 years ago so it is not especially fresh in my mind, but here goes. Once you have the coach on ramps high enough to protect you and on level ground, then put blocks between the 2 frames. With the Coach running loosen one of the rear rods and move it until the bag expands to 10 inches. Then just snug down the locking nut, don't tighten it just yet. Then do the same thing for the other side rear bags. At this point they should be pretty close to 10 inches, but you may have to tweak them to get them both to stay at exactly 10 inches.
Now move to the front valve and set it at 10 inches. Measure all the bags again and tweak as needed. Hopefully you will not need to adjust them more than once or twice. Then lock down the locking nut/bolt.