Wvabeer,
Nice looking rig. I am guessing that you have 5000# on your rear axle. I have the same basic truck as you do. Unloaded with me and a full tank of gas, it weighs 6000#. Yours will also weigh 6000#.
You did the right thing with the air bags, rims, and tires. It will increase yuor GVWR from 7200 to 7700, just like mine.
My loaded camper actually weights 1700-1800 and ends up putting almost exactly 4000# on the rear axle.
I see that your loaded camper is around 2800#, about 1000# more than mine. Most of this weight will be on the rear. Have you weighed it? what's the rear axle number? I'd like to get a hard side as well. Thanks.