I have a GMC Denali and have rear suspension problems have replaced the air pump once I still sets down and does not level off. Is there an additional suspension kit to increase the support of the rear end of the vehicle?
I have some tools etc.
If you’re going to keep this truck for a few years, I suggest you convert it to a conventional suspension setup
Google it
Is the height sensor working or even connected? Does the air compressor even try to pump up the rear?
Are you towing with this and expecting the rear lift to level the truck - and it won’t? If that’s the case, it never will. So get load equalizer bars, you have too much tongue weight on your trailer for only a hitch ball.