I went from Timbrens to the Roadmaster setup and I like it a lot better. Sadly I haven't had much more weight than my topper plus a couple hundred pounds, but it handled it great. It does raise the rear up about 1.5" (or at least it did it on mine). Driving around empty is almost as good as when it was stock, the timbrens were much more noticeable. I also haven't done a ton of 4-wheeling with them, but the little amount that I have done since installing them was pretty smooth. For real 4-wheeling, I plan to take them off before doing so.
One good thing is that at least with my ZR2, I didn't have to replace the shackles, so install time was pretty quick. A thing I do worry about is even after just 5 months of being on the truck, the bolts look pretty darn rusty (and they don't use salt in Colorado). I'm probably going to send pics to Roadmaster and see what they say. The rest of the hardware looks great.
2018 Colorado ZR2 Diesel CCSB Satin Steel, 1" RC leveling kit, 285/70/16 Falken Wildpeak AT3Ws, Timbren SES to prevent sag.
2013 Cadillac ATS4 3.6 Performance Thunder Gray Chromaflair