FWIW, anytime any tech says they are working on a fix, that means they will fix it in the next model refresh. I also have the lean.
I put Firestone airbags on the rear, level, and pulls 4000lb trailer no problem.My cement floor is level and when measuring from the floor to the lower lip of the wheel well to the cement, the front of the truck is 1/2 inch lower on the Driver Side than the Passenger Side. In the rear of the truck the Driver side is over an inch lower on the Driver Side than the Passenger Side. This is not due to weight of the fuel tank since I am sitting on 1/4 tank of fuel with these measurements.
Anybody else have a difference like this? Currently have about 5000 miles.