When I stated nuts I was not trying to criticize the rules. I just meant it would be nuts to take my rig through the mountains and play around with tires and some sort of chain setup.. I have done mountain driving in a semi but a large MH pulling a PU is different. The truck does not follow the ruts created by the RV. The brake system in the truck is not like the 2 axle braking of a trailer. The semi has the advantage of a Jake brake. On icy roads I avoid the brakes and just use stage 1 of the jake. I went from Calgary to the coast in a semi this summer. The construction was terrible and the detour was not great. And that was on dry roads. Thanks for all the info.