Yeah Loren has it right. The LSD(waiting for a joke) will give you
much improved inline traction,  and better power oversteering for
exiting corners, but with ice or any source of lower traction it
greatly lowers the threshold at which controlled power oversteer
becomes loss of control and a spin vs. 1 wheel drive(open diff). The
vanagon wheelbase is pretty short to begin with, but most people
aren't speed demons that drive them.. it's pretty subjective as to if
it's a good idea or not.. what are your goals?

Jim Akiba