I don't know the exact distance between the camber, but I know it fits EXACTLY on the J-hooks, so I would guess at 48" give or take. I will measure tonight when I get home.
We are still hurting for lifters. We have 4 of us right now, but only myself and one other are there everyday.
I am working on building a monolift attachment for the rack, so hopefully that will draw us another guy or 2.