I've begun the process of shopping for a Ram 2500 diesel with a manual transmission and I'm finding both 5 speed and 6 speed transmissions within my budget. I was wondering what advantages/disadvantages either configuration might have regarding durability, usefulness, etc. I live in Denver and will be traveling over mountain passes, so at first thought the 6 speed sounds appealing but these motors have so much torque that I'm wondering if a 5 speed would work well enough for me to allow my search to broaden a bit and include more trucks. I don't plan on towing anything but I may eventually outfit it with a slide in pop-up camper and occasionally wheel it. Any words of wisdom for me?