Def ReadyLift over RC IMO…
But Zone (sister company of BDS) make a great 1.75” kit too for the AT4. I used these UCAs on mine and happy with the alignment and look/feel of parts.
Specially designed for the 2019-2021 Chevy Trail Boss and GMC AT4 trucks, these kits are designed to a higher standard, working within the parameters of the factory suspension and steering geometry to maximize potential while allowing optimal clearance for larger tires. Kits include strut...
zoneoffroad.com
Though the 5100s are a great option and I used on my Bronco. Happy with that level and ride comfort, etc…
Leveled just looks so much better!

Here are some before and after pics of my 2023
Thanks and good luck!!