Hi Flivver,
I also live in Dubai and do a lot of big dune desert driving (Liwa / Sweihan / Badayer).
I have a TJ Sport Manual Trans (6 speed) on 32" tires with stock 3.73 gears.
I end up using 4 low in the big dunes (3rd and 4th) to get the torque I need.
I have been looking into 4.56 gears...