I don't have much experience off-road, but I will relate one story that occured a few years back (the last time the "Aberdeen" show was held at Churchville). For those that remember, it rained quite a bit and all of the trucks entering and leaving the show really churned up the fields. In spots, the mud was a foot or more deep. The show organizers called in a tri-axle dump with about 40 tons of crushed stone. The intention was to drop the stone in a few of the more serious mud holes. Anyway, as you would expect, that tri-axle made it about half way into the first field before it became mired. A couple of deuces tried to pull the truck out, but to no avail (not enough a** to 'em). Someone came and got me because I was told that I had "the biggest truck out here and the show organizers want some help." So, I fired the M813A1 up. My M813A1 was a former USMC truck with 1400 X 20 super singles and lockers. I drove over to the tri-axle as if the field were dry. I hooked up to the truck and proceeded to snap the chain because I tried to jerk the tri-axle out. The chain was no where near stout enough to handle that force. A friend suggested that I pull the dump at an angle in the front. This did the trick. I never laid off of the throttle and pulled that baby right out to the street. Sorry...I don't have any digital pics.
Given the fact that most deuces do not have lockers, I'd take a 5 ton with them over a deuce any day. Also, a truck with an automatic has an advantage, too.