Make it handle

[BMERDOC]

Here is a question I was just asked and before I sit and ponder it I wanted to post it.

Does lowering the rear (leveling the truck) affect front caster in a "positive" way?

My initial thought is yes. It does affect the effective front caster towards more positive angle because as the rear is lowered the centerline of the front ball joints is turned back. My alignment machine asks for chassis angle so I figure it uses that to help calculate caster. I'm not sure by how much without doing the tests but if I visualize it correctly it would have a Positive effect on front camber.