I've got a 2004 F150 Supercrew 5.4, 3.73, 4x4 that I really like. I'd like to tow my 40 to Utah or Colorado every few years (~1000 miles each way). Anyone have any experience they'd like to share? I know the truck is rated to do it and my gas mileage will be awful, but am I going to be going 35-40 mph up long grades in Colorado? Any upgrades I should consider? Its got a tranny cooler, but I'm unsure if I should get a bigger one.