This is a very good point. Many people don't realize that 4X4 vehicles with
out a locking or limited slip differential have power going to only two
wheels, one front and one rear. Similarly, 2X4 vehicles without the locking
differential are actually one wheel drive except on a dead straight with no
differences in traction on either wheel. My 2wd Suburban with a limited slip
will go through almost anything.
Colin