Different side to side rear heights??

I have the factory TSB 4leaf pack (Canadian truck) with about 20k miles on it. There is 3/4 - 1" difference from the left rear to the right rear on a near empty tank of gas (not sure if it changes will a full or not, but ill find out). (Right being higher) I was wondering if this is normal? I have warranty, is this something they would take seriously? or laugh me out of the dealership?

 

my truck does this also, and on the same side, i think people call it the tacoma lean because i beleive most of them do it, i could be wrong though

 

..double post..

 

+1 Tacoma Lean.

Gas tank and battery are on the drivers side, so even when the truck is empty, it hangs a little to the left ... completely normal. Mine hangs a little to the left too

 

Oh okay.. I was aware of the taco lean, but i thought it was just for the front, not the rear. Thanks for clearing that up. I plan on lifting my rear up a bit, is there anything i can do to get it back on level? I already have a spacer for the front

 

ive got the spacer and a rear aal but it still has it :/