I have just bought a GM120 to use in off road and it's amazing, was outdoors last weekend and some drivers had thermalling issues, the GM never got over 40 deg. (4WD with 6.5)
If you going 4WD 6.5 would be fine, in 2WD may be a little hairy but you could de-tune it a bit on the speedo.
As MattW said use mode 2, but I have tweaked it a bit with the software, to get better brakes etc.
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