A number of people here (and other forums) have successfully installed the Airlift 1000 Air Spring Kit in order to firm up the rear axle for towing/hauling applications.
Across many posts, people suggest various install techniques, including how many sections of the OEM bump stops to remove.
I wanted to share my experience with a kit recently purchased from etrailer.com (part # 60804).
First, it seems that the instructions are actually accurate in suggesting how many sections of OEM rubber spring to remove. I originally removed 2 sections (as suggested by many forum members/youtube), and realized that there was no way to even fit the DEFLATED bag properly without removing the spring. The bag was touching the rubber stop even with axle dropped completely.
I then removed another section (for the total of 3), and the spring was able to fit.
Also, there is no longer a "puck" included with the air bags, and the instructions suggest to install the bags with airline facing up and through the hole in the OEM bump stop, similar to some youtube videos/posts here.
Here's my dilemma. I stupidly did not measure the stock ride heights
before installing the bags. After lowering the vehicle and inflating to the minimum pressure (5 PSI). It seems that the rear is jacked up quite a bit. The bags are in contact with the rubber stops with the vehicle unloaded.
I know this is a super long shot, but is anyone able to measure/knows of what the wheel well height should be for a 2015 SR5 with stock suspension?
I am trying to validate what I'm seeing, and whether I need to redo the setup to return to stock (or close) at 5 PSI.
Here are some pics from the updated manual:
My install (with the axle dropped all the way, 0 PSI).