Timbrens, air bags or air hitch

If your suspension is supporting the pin weight just fine, and it should with a dually, go with the air hitch. I love mine.

Air bags are not for me - a lot of that has to do with the 16 ply tires at 90-100psi, but the air bags made the unloaded ride a whole lot rougher. Enough to where we eventually opted for a full air ride. If you can afford that, I highly recommend it. A TS hitch (while expensive) is a whole lot less money and would have been sufficient for us if not for wanting to keep SRW. I would recommend replacing the stock Rancho shocks with Bilstein or Fox 2.0.

I am very happy with the Timbrens on my truck. No change to the unloaded ride, and not a dramatic change to the loaded ride either, except that it feels a little more planted and more importantly it handles bumps at speed far better now. You hear it and feel a little bump and on down the road you go. They seem high quality and were very easy to install. The fact that they're only attached at one end was appealing as I don't have to worry about over-stretching a bag off-road, and they're also zero maintenance.

At about $200 it isn't much of a loss if you decide you don't like them, but I think you would.

I found the ride characteristics very unsettled with timbrens and a partial load, air bags worked much better for me. May not be an issue for you with such a heavy pin weight except when solo. But air bags can be adjusted to fit your specific weights, and with an onboard compressor you can adjust them on the fly. Anyway, air bags get my vote.

Experiencing a similar problem, I queried the guys over on the Silverado/Sierra forum. For helping with bottoming out, the vote was about 80% for the Timbrens and 20% for the air bags. The other big part of the equation is stopping the reaction (the bouncing after the original bump). The 100% overwhelming response was for Bilstein 4600 series shocks. The Timbrems and the shocks are in my cart on Amazon to order when we're in one place long enough to receive them.

Rob