Ultra-wide tires add a bit of tube protection just because there is more rubber.
But I've pinch flatted on the road at 25psi on 2.0 tires.
With my UST setup, I can run my 2.3" Conti Verts at 20psi all day and not have problems. My 2.0" Mosquitos feel like they are going to roll off the rim at 20psi.
I was kidding about the girl scout thing by the way. lol