MAN and others are doing a 6x4 with a PTO hydraulic assist drive on the front axial for a temporary low speed 6x6. I'm sure it's not cheep down here.
Other wise look at what the power companies do for there offroad trucks.
For the money as stated above a set of super singles on the front to reduce sinking and a CTI system and full diff locks on both rear axles like the forestry trucks plus front and rear winches.
Z
https://www.youtube.com/watch?v=EEVjN251a1Y
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