We had a nearly identical looking army truck with a 5000 gallon water tank for watering the pull truck/tractor track that my friend owned. We put a second 2:1 transfer case in the drive line so it could creep slow enough to soak the track in one pass and thus avoid making tire ruts while allowing the rpm to be high enough to handle the 40,000 pound load. Worked good and empty with minimum rpm it would really creep slow.
