I consider the brakes adequate, not great, but certainly not unsafe.
I too have experienced rear end hop on a hard surface, fairly hard cornering with an uneven road surface (pot holes). It has been a while since I've driven a truck and I figured it was the light rear end acting squirrelly. It only does this once in a while fairly aggressive road driving. At no time did I think I was not in control of the truck and it corrected itself pretty quickly.
Regardless, the truck handles far better than I could have hoped and I'm more than willing and capable of handling a bit of a skipping rear end once in a while. I doubt it will do the same on a dirt surface.
My tires are at 40 PSI, I may try them at 36 as well.