With out driving it myself its hard to pin point but I have a question. Does it do it on dry roads at all? If the ABS kicks in on DRY roads at low speeds (usually 5 mph and lower)its most likely a front sensor.This is done by watching the scanner for the one that drops out 3 or more mph than the other ones. Depending on build date some come with the whole hub. If its doing it only on snow covered roads and you feel its NOT NORMAL ABS operation (remember they are very sensitive) then I would check the rear rotors for rust and corrosion that could limit surface contact between pad and rotor cause front to do most of the work and skid. (rusty/corroded rotors very common on GM)

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