Looking for suggestions on upgrading my shocks. Long bed, SRW, pulling a Paradigm 310RL. Pin weight around 3400 depending on the trip. I currently have 17,000+ miles and run air bags at 30 psi when hauling. Rides good loaded and good when unloaded (air bags to 5 psi). But I am thinking I can realize a better unloaded ride with upgraded shocks (Bilstein or. ?). Thanks.