I want to lift the rear of my Montero to give a slight rake to it. After lifting the front by turning my factory torsion bars, the front and rear is sitting level (unloaded - no weight in the back). However, I want to give it a slight rake to it so when I'm loaded down with camping gear and my two dogs, the rig will sit even vs sagging in the rear. What options do I have to achieve this in the rear? Do I need to upgrade my rear springs or can I just buy those 10mm trim packers ARB sells?