Drivers side lean, but never lifted or added a leaf???

I've heard of the Taco Lean, but I thought it was always from lifting a truck. I have been noticing my drivers side is a bit lower than my passenger side. Also, I have felt the front drivers side tire bottom out a couple times when hitting a speed bump a little too fast. Idk if I should be looking at a spacer, or looking for a broken part, maybe shock or coil? Or am I just bottoming out on that side because it is sitting low?

 

I just finished installing new coils(885) and bilstein 5100's upfront. Also new skyjacker 2.5" lift leaf springs and extended bilstein 5100's. All new, and fuel thank is almost empty. I still get 1" lower(front and back) on the driver side. I think is a structural problem more than a weight problem. Of course many people here are going to give you their own hypothesis, but I could assure you, that even if I flipped sides with shocks and springs, I would still get one inch lower on driver side. Probably a manufacturer defect that Toyota has not addressed yet!

 

It is normal. Has to do with all the weight being on the left side of the truck. You could order a 1/4" spacer for the front driver coil to correct the lean

 

SMMarine is right. The truck overall is not balanced as one would assume.
The fuel tank adds to the problem.