i am going on a 1500 mile round trip soon. i will be towing my toyhauler(4500lbs) through northern new mexico to colorado. i have never been on o trip this long while pulling a trailer. not sure if i am going to encounter snow or not. but i want to prepare for the worst. i have only towed flat ground and never mountains. my truck doesnot have any extra gauges. and has only 1600 miles on it. should i be concerned with transmission temp? also should i be concerned about my trailers water lines in 30 deg weather. my toyhauler is a fair weather set up, no serious insulation. just trying to think of everything before i hit the road. any help or suggestions would be great. thanks alot