I'll add my 2 cents. Had a 2001 F350 dually with Arctic Fox 1140 in bed. Heavy. Running Cooper AT3, then General ATX, liked both. Incredible on snow, backcountry roads near Aspen and Ouray, in a driving blizzard over Red Mountain Pass, hauling along on US40 at 75mph, twisting paved mountains in New Mexico, and even some narrower places with rock overhangs. Handled like a dream going down 15" of pow at the campground entrance above Silverton, with no one there of course, and drove all around the terrain through marshy snow, etc to see how it would do. Nary a wheel spin. Awesome in Moab, running backcountry and 4-wheeling -- 6-wheeling. Had Rancho 9000, Helwig sway, Timbrens, add-a-leafs, and 33's, with manual front lockers. Dream machine. Could do everything not too skinny or too low branches. Run with a pole saw. If I were doing Rockies and desert and Pacific Northwest, a dually is fine. Fine fine. A bad brake job did it in, they left a bolt loose in rear and blew the rear axle on the freeway with the camper, just having passed a semi, and got to guardrail in 6 seconds. 1 second more, the rear wheels fly 300' and we roll. The old Fords use a bad design for torquing axles internally... I'd have no hesitation with a Dodge, Ram, GM, or more modern Ford (2015 on up), to go dually. If F450 could have simple super singles that are about 6" more inward that the outside edge of a dually, 3" per side, and the front pushed out with offset to meet track, it would be a great way to narrow the big truck enough to get more places without sacrificing the great front turning radius, or weight distribution too much. Otherwise, IMHO, pick a smaller camper and go 350/3500 with factory singles. I don't envy the folks doing heavy heavy work off road. BAT's have been working remote a long time, I think too many newbies are afraid of big trucks in small places, and that is good! It's those intermediate places past the RAV4's and factory ForRunners and Tahoes, yet not all the way up the skinny trail to the Gladiator and Wrangler and Tacoma builds, that suits big trucks just fine.