[Blaznjoe]

Interesting question. I also own an air suspension Treg (08' V8) which is coming up on 130K miles and have been wondering if I should do anything, proactive. The only area I am considering is the air pump (under the frame/passenger side) as I've seen a few YouTube videos about the seal on the pump failing. I think replacing the upper and lower control arms is a good call. I personally replaced my lower control arms at 99K miles and they were shot to hell. When I decide to step up and replace the upper control arms, I would inspect the ride-height sensors and repair or replace, and I would also replace the brass air valve attached to the strut since they would have to be removed in order to remove the strut. I don't think you need to buy close to $6K (parts only) for the fancy new Bilstein air struts but that's up to your wallet. Or, if your struts are looking corroded, due to salty roads traveled, then I'd probably replace them. However, I would try to source used air-struts from the inter-webs to keep the cost down.
I can't think of anything else but hopefully others will chime in with help or opinions. Let us know what you decide and how it turns out.
Good luck! 🍻