Mercedes 1850 converted to 4x4

[powerstroke_1999]

Hey guys I was wondering what you all thought would be the best way to convert one of these 1850L delivery trucks to a 4x4.I just ordered one Friday I was thinking of using the tamiya high lift front axle.And a transfercase from rc4wd To connect front and rear axles to transmission.I want to run rc4wd 1.9 mud plugger tires and humvee beadlock wheels.Not sure what I will have to do to the rear for the wheels because its a dually unless I change out the rear axle to.