My truck is exactly the same, I really doubt the op has more pin weight than I do I have 4,500# plus hitch and tool box that is full. The rear axle weighs 8,780# loaded. My truck sits level without bags. I added them to help control the spring action you get on some of these horrible roads we all travel. I also installed 4600 Bilstiens. This combo really helped the ride. I only run 30psi in the bags just enough to dampen the springs. That pressure does not raise the ride height.
OP I suggest you see how the ride is and then decide if you need any upgrades. Hard to see from pic but it looks like you are sitting level as I do hooked up.
I run 80psi in front tires at all times 45 rear solo and 60 when towing. Weigh your axles loaded and use the weight charts and you will see those are good pressures and will give the best ride.