Yeah, my vote has got to go for a Uni-Mog. Never heard of them before this happened, follow along.
In the US Army, 1981-1884. Went to Kaiserslautern Germany right after basic & AIT (as a 64C- Motor Transport Operator, & drove M915 line haul Semi-Trucks, all over Germany, Holland, Belgium, Luxembourg, etc..). Stayed there until I got out. One year, they had a program to better acquaint us with the German equivalent of us---German Motor Transport Operators. So, they sent 2 guys from the active German Army to our unit. 1 got assigned to me, for 2 weeks. I had to teach him how to drive our trucks. Was difficult with the language barrier & all, but before too long, he learned to just watch. He did good & the 2 weeks were up in no time. The following year, they told us 2, that we had to go the German Army barracks & learn how to drive their vehicles, for 2 weeks. What a cool time that was. Got to shoot all their guns & rifles & the Uzi. They had a turkey shoot (actually a pic of a deer) with an Olympic match grade custom 22LR w/peep sights. I won the shoot & got to take the plaque home, which is still hanging up, but it was pure luck, I barely touched the trigger, inhaled & it went off. But in the end, mine was the closest to it's heart. When it came to trucks, they were bragging so much about their Mercedes Benz Uni-Mogs, I asked them to show us why they were the best. Boy did they. Not sure if it was authorized or not but here is what they did. It was a 1981 with the triple transmission, meaning 20 or more forward gears & I think 3 in reverse. It was geared so lo, that it was rated in meters per hour, when in lo, lo, lo. It had a hand throttle that you could set & have a higher rpm (for winching & such, or farm type work). So, they had this contraption made up to hold the steering wheel straight. Put it in lo, lo, lo & drove it up to a hardened cement ammo bunker, with walls that must have been about 45* incline at least. They aired down the tires, put the contraption over the steering wheel, adjusted the hand throttle, let out the clutch, & then he jumped out. There was no one in the truck at all. There were about 10 soldiers up on top of the building. It drove right up to it, the bumper hit first. It kept pushing, the bumper slid & the front tires grabbed & it drove itself right up the darn building. We were in total disbelief. When it got to the top, the soldiers turned it around, put the contraption back on the steering wheel & it drove itself down as well. It took most of the morning. I would have bet the farm that there was no way, no how it could do that. And I would have lost. It was the most amazing thing I had ever seen a vehicle do. They said it could do it with 2-3000lbs in the bed as well. From that day forward I would say, when an American truck grows up, it want's to be a UNI-Mog. My Power Wagon w/G56, has a crawl ratio of 78:1, the lowest of any American truck. Even a Jeep Rubicon w/manual trans, 4.10's & the 4:1 lo range is 73:1. The Uni-Mogs is like 3200:1.
Not a 1981, but you get the idea.