I'm moving soon from Napa, CA area to the Asheville, NC area. I'm driving a 26' Budget truck (diesel, if I recall correctly) towing either a car dolly with a '98 Camry or a 6x12 trailer (if I can find one that cost less than a house ;-). The truck is going to packed to the gills (including the trailer or car pulled behind it). My worry is crossing the mountain range here in West on my way back to NC. Given how loaded down the truck will be, I'm assuming it would be wise to go with the route that offers the least severe grades to reduce danger of overheating, etc.
My questions is, would I be better off taking the I-80 route or the I-40 Route? Is there that much of a difference, and if so, which would be the better option?