I'm planning a trip up to the High Alps in January and am starting to prep the truck. It's 4-5 days of pretty extreme wheelin'. So I have a couple of questions for those from the mountains and faaaar north. If you're running snow chains over rough terrain, do you air down as normal or leave it at road pressure? I'm not sure how chains react. (this is on 35" BFG MTs) Also, I'm doing this in a TBI '91 truck. I've burnt my own chip but it's all been at sea level to a few hundred feet. Will the ecu be able to compensate for wheelin' at 3000 meters? Most of the time we will be between 2000 to 3000 meters apart from the 1200 mile road trip. Any thoughts appreciated.