I've only ever ran the front roll bar as it takes most of the bite away. I tried running both and the bite comes back also running both I thought just made the car unpredictable.
I suspect the rear isn't needed because the weight of the cells in the rango down the centre line of the car. In theory it won't produce as much roll on the rear end unlike say Tamiya and Associated for example. Dunno if that's a good or bad thing????
