Failing leafs or Tacoma lean?

My truck: 2010 reg cab, X Runner leafs, 2” tapered lowering block, QA1s

I took a measurement today and find the rear driver side is 1” lower than the passenger side (axle to fender). Is this typical Tacoma lean or is the leaf spring failing?

 

Do you have a sway bar front or rear? How much fuel is in the tank? With sway bar removed, 1" is within the margin of error for Taco Lean on the two 6-luggers I've owned.

 

Prob a little of both to be honest. Original leafs?

 

Thanks for the input; I have a full tank, and the leafs were switched probably around 4 years ago. I’ll continue to watch it and see if it gets better or worse as we go.