Climbing a slippery or snow-covered road in a tractor trailer can be quite a challenge for any truck driver.
A 35+ year veteran trucker, gives a few tips for successfully climbing a slippery grade and descending too.
Watch a demonstration of climbing the grade, while the driver uses a few techniques useful to prevent slides.

TrustNothing:generally true, because its slowing the tractor down and the only reason the trailer is slowing down is because the tractor is in the way, if the ground is slippery all that weight is going to push into the tractor and could force a jackknife scenario.