Sorry, was hoping to get the pictures to come through and that would've answered the questions. It's a club cab, 4x4 2500. The model of the camper is 10FX. So yeah, I'm admittedly over the GVWR. My best info on the camper weight is 2,100 dry. I don't see an info plate anywhere near the rear door that says the weight, so I got the estimated dry weight from the brochure in the paperwork I have. My best guess for the thing wet would be around 3,500 lbs ready to go. I know the truck weighs 6500, minus a big steel gooseneck hitch that I have since removed.
Yes, the rear end is sagging. I'm about a 1/2 inch off of the bump stops with the camper on. When I ordered the airbags, I was listening to some older gentlemen who recommended doing that. Wasn't until I started doing research when I found out that this may not be my overall fix.
Edit: forgot to address this. Tires are 10 ply rated for 3750 lbs each at 80psi. So I believe I'm well within the limits of the tires and also with the Dana 80 rear axle.