Newer Powerstrokes are not even close as problematic as the old ones although they still have their issues... If you want reliable, get a Cummins.
Thought you might enjoy this, 6x6 Tartra-815 vs 6x6 ZIL-157 offroading:Talking about AWD... Many moons ago I was working in Krakow, Poland in the trucking company, where we were using Check trucks Tatra as a "balast tractors" - trucks with concrete block attached to the frame behind the cab for better traction. They were used to pull heavy trailers, equipped with 4 axles, 8 wheels per axle. Tatras were truly 6WD, with lockable 3 axles and all differs. One day they bought Russian KrAZ to do the same job. Proud driver washed it in freezing temperature and... when he finished he couldn't move it. 3 wheels, one on each axle, were spinning, but other three where solidly frozen to the flat, concrete place he was at. I am not sure now if he just didn't know how to lock the differentials, or that truck didn't have that option, but then we thought it didn't have it and everybody were laughing at that "military grade Russian vehicle, which is stuck on flat, concrete place.