I bought Rancho RS 9000 Shocks for our truck. Best thing I have ever bought for a better ride. Empty or loaded they do the job, only takes me 3 minutes or less to redo the sittings for the best ride.
RS-9000 shock link They also have the $100 rebate on a set of 4 shocks through June. That is what I used to buy mine, plus found them with 25% off from the seller. Think I had around $33. each in mine a few years back.
The only way the air bags will help the ride is if the tire pressure is set at what the Tire Mgf shows for your load. PLus less spring pack, as the springs are what makes it ride harsh.
Pete