No, I have the G177s and I have them singled w/o flipping the hub. I know . . . I've heard that this can be hard on the bearings but I like the wider stance and I dont really carry loads in the bed other than personal stuff, I pull trailers instead.
As far as single verses dual, I feel singled is much more monuverable. 8 wheels trying to go straight ahead and only 2 wanting it to turn. Also duals off-road, and especially in rocky terrain, is much less appealing. A majority of my travels is off on dirt tracks and primitive roads. And then there is the wearing out 10 tires at a time instead of 6 . . .