wheel measurements

so i was taking some measurements from wheel center to fender....both fronts 21".....but, in the rear ...
d/s 22"
p/s 22.5"
any idea why the passenger side would be .5" taller?.....i don't have any weighted mods or anything and the wheel/tires all measure the same
thanks

 

Battery gas tank and driver are all on driver's side.

 

well....the battery is up front....and so is the driver when someone is in it, but it was unoccupied during measurements.....
i guess that it could be the gas tank, although i hate to think that 1/2 tank of gas is gonna make one side squat that much.....
oh well.....i guess it doesn't matter if the back is crooked so long as it drives straight....
thanks for the response

 

Search "Toyota lean" Or as it's called here "Taco lean".

 

If you're feelin curious, measure from center of axle to bottom of frame on both sides and see if the theory is correct. TBH, I've never actually verified it myself, but here I am parroting it too.

 

lol just because the battery is up front does not mean that weight does not affect the back.