I ordered from the factory...used the online Ford 'Build' tool to get just what I wanted and then sat down at dealership and used the printout to order truck. Get the camper package and 4.3 rear end...the rest is bells and whistles. I went gas over diesel for a bunch of reasons but thats another discussion. The long bed dually crewcab will let you get just about any TC out there with no problems (I'm well under weight fully loaded with Arctic Fox 1150). The only unknowns are if you plan on towing with the TC...then maybe the diesel and or 450/550. My .02