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Rawze

No need to try to re-invent the wheel that the industry has already figured out ...

If you go full lockers, you need to do both axles ... otherwise there is little to no point to it.

For the same reasons, Also, only 3 positions should be used ...

OFF> none
A> inter-axle lock position (only lock driveshaft between the front/rear diff)
B> full lock everything position.

OFF, A, or B.

People who run in the mud also report ...

++ It is handy to also have a fairly quick way to air up tires on the truck (via a hose on the catwalk) ... as sometimes you have to let half the air out of them for more grip to get out of a hole if its bad enough. That or always have a stack of sacrificial moving blankets handy to throw in in front of the tires as a last resort.

++ That the back axles need tall lug, open shoulder tires too. This helps a lot to keep from getting stuck, which indirectly means that your fuel mileage is going to suffer all the time too.