I am not trading in my truck for a DRW pickup. I don't buy the argument if you need air bags you are overloaded. My dad needed air bags on a DWR 3500 Crew Chevy and a DWR F350 Crew with a Lance slide in. I'm not wanting air bags to help towing. I was wanting them to bring the rear end up some.
The new shocks isn't for the sag, but the reason the Timbrens rode rough. My thought( and maybe the Moderators also) is that bad shocks would allow the rear suspension to travel faster and further than it would if the shocks were in good working condition allowing the Timbren to come into contact unloaded.