been having some discussion about when it's safe to use 4 wheel drive. picture a two lane road with 55mph limit that has snow in the center and inbetween the tires down the center of the truck. not much too often under the actual tires. hopefully that makes some sort of sense. would you keep it in 4 wheel while going 50-55 for about an hour? something tells me it's not the best for the truck but every so often we come across parts of the road that are all snow covered for stretches at a time. Thing is a buddy has a Z71 that has in 4 wheel all the freakin time when we're on roads like i described above with no problems and is trying to convince me to do the same it won't hurt anything. any opnions on this?