"This...now shows a pair of your skis affixed to a Kress Challenger 95 - a modified
version of the CAT Challenger 95.  The Kress tractor weighs51,420 pounds.  It was
not broken.  Rather, we were merely testing the efficacy of the recovery ski system on
it...as the pictures will show, we were impressed with the floatation they offered the
towed tractor: note the difference in the rut depths of the "skied" tractor next to the
"unskied" tractor tracks."                                John Wright      South Pole Traverse Manager