I had an old Toyota that was lower on one side, it will also effect the height of the year as well, your torsion bars are probably a little worn, especially the driver side since that is where you do most of your sitting, 20 gallons of fuel is pretty heavy as well, new torsion bars will restore the front end real nicely, Sway Away are really nice, make sure they are the bigger 300M kind not the 25mm powerbarz,

97 FZJ80, Stock, Factory Lockers.