I tow two different boats a few times a month. A bass boat and a ski boat. Both caused some significant rear suspension sag. I ordered the Timber Grove Gen2 air bag kit from Nick @797Performance.
https://797performance.com/products...x-rho-gen2-rear-asam-air-spring-kit-sq7785000
This kit is STOUT! Very well designed. I purchased it before the new style Airlift kit with the cup style lower bag mounts came out . Had I waited, I may have gone that route, but I have NO regrets about going with the Timber Grove kit. I use a portable Milwaukee air compressor for adjustments. 2 PSI seems to be perfect for unloaded daily driving. I only have to increase to 7ps to maintain level when towing the bass boat, and 12 psi towing the ski boat. My truck has the Eibach 2.7/1.5 pro kit installed, and there were no issues using this kit with the lift springs.