I installed the lower quick disconnect stableloads first. They made a huge difference and greatly reduced sag. They also tightened up the rear suspension so it felt more controlled. Without them there was a bunch of suspension travel and I felt it bottom out on the factory jounce bumpers a few times.
The lower stableloads are going to make the most difference vs the uppers. The lowers take up the slack to your lower overload spring which is very thick. The uppers stableloads use the smaller overload spring at the top of your spring pack. I'm sure that will help when used in conjunction with the lowers but I wouldn't start with the uppers.
I had a disdain for air bags. I used them before. I did not like the requirement of always running with air pressure even when unloaded. I found the Airlift bags that now come with internal jounce bumpers eliminating the requirement to have air pressure even when empty. So far I like them. I do not need a bunch of air pressure when carrying my TC, although I am on the lighter side. The bags are the icing on the cake and allow me set the ride height where I want and add just that final touch of stability and load capacity.
It's a good, better, best kind of deal is how I'd put it. I'll just restate the advice that was given to me....try one thing out at a time. No need to do it all at once, see how it feels and works for you and your setup.
I am positive that Timbrens or anything like it are not for me. I know I wouldn't like them at all. I have tried helper springs in the past, albeit not on this truck and not carrying a TC. But they all destroyed the ride of the truck when empty. If you never unloaded, then those would probably be best. It's all a compromise in one way or another.
Man that got long winded. Basically I chose what I did because when I am not loaded or hauling, there is no effect on my suspension with the airbags at 0 pressure and the stableloads in their disconnected setting. I like that. But when I am loaded, the combo works very well.
