2015 Chevy Silverado 2500HD, Improving Unloaded Ride

I've got the Rancho 9000's and turn them down to 1 unloaded, and 9 when loaded. It's a huge improvement, but yeah, it still rides like a truck. Lower tire pressure would help, but I'm too lazy to lower the pressure on 6 tires so just endure the ride. Sand bags would also help, but that becomes a storage problem.