reasearch will set you free...
You will notice that all 4Runners (FJ's too) have a side to side lean of between 1/4" to 3/4" with the drivers side being lower. Mine is a about 1/2" lower. This is due to the weight of the battery and gas tank both being on the drivers side. I am not sure why Toyota lets this be, as they do have a unique driver side coil spring which is longer, stiffer and has more coils than the passenger side. In the case of the 2011 FJ 4WD the front driver spring is marked with purple/gray paint while the passenger side is purple/orange.