2013 Chevy Express 3500 Passenger Van - Suspension Upgrade

We have a 2012 Express 3500. The ride is great for a 1-ton vehicle, but it seems like a combination of stiff tires and underdamped suspention. The ride improves significantly with lower tire pressure. We run them at 50psi in the front, and 65 psi in the rear and it's a noticeable improvement. Also, Bilsteins should be installed from the moment of purchase. The OEM shocks are junk. They should take care of the rest. Airbags improve the loaded ride quality, and make the empty ride worse.