Every truck is a little different but they all seem to range from 1.5-2" higher in the rear.
I always feel like my truck is sitting real close to level (screw, no mods), so I went out to the garage and measured.
With 1/2 tank of fuel, 40psi in all 4 tires:
Front- 40" @top of wheel well (bottom of flare)
Rear- 41".
Tire squat is identical as close as I can measure.
I really like the level low slung look, which is why I think this truck looks great as is!
1" higher in the rear is about right. If I try to get it closer I know I would mess up and end up high in the front which is unacceptable. This way I can haul whatever in the box without it looking silly.