Everything that makes the Rubicon good off-road makes it bad on-road in snow/ice. Tires are too wide, CoG too high, too light in the rear, short wheelbase, wide stance.How so, what tires are you running?
The best car in the snow will be, well, a car - not an SUV, with a low CoG, skinny tires, and AWD with a decent traction control system. Like a Subaru for instance.
There's a reason rally cars are cars.