If you live in snow country, you should get your limited slip.  It will
help.  That behavior someone mentioned with the rear end walking
around...not likely to happen, and if it does, it isn't hard to ease up on
the gas pedal, is it?
  Trying to get around in an "Open diff" vehicle in slippery conditions is
fairly risky because you have to  hit any hill faster than is prudent to
keep going up, you get stuck all the time in dangerous places and have to
lie down and chain up, you can impede the other traffic and cause them to
try unsafe passes when you are creeping along with one wheel spinning and
the other one freewheeling...
  I can't believe the Vanagon came without a limited slip..Mine is worthless
uphill or in sand or snow..I'll be having one installed very soon..  Till I
do, I am forced to carry around about 400 extra lbs over the rear wheels and
to 'Get a run at" steep hills or driveways with snow or slick mud..Or drive
my big fuel hog diesel 4x4 truck..
  Don Hanson