I always try to pack mine as balanced as possible when going on trips... but I have noticed when unloaded and my Excel long range tank is full (passenger side) the truck will lean to that side. No problem for me because my water tank is on the other side but I see your point and thought of it while deciding on this setup
I think the way these coil sprung utes are setup a little weight difference can make them tilt. And I bet your springs are quite flexy. But I also don;t think it matters much. Although for you Buck it may due to your propensity tro drive where trucks should not
. I would think for your puropses you should try to mount things equally espicially while trying the gnarly stuff, that little difference may save you from going over some day.
Just a thought, Have you looked to see if anything is bent?