Just an update...
On the 06 X2, really the only easy to winterize the ballast is buy 3 gallons of anti freeze.
To the left of the distribution manifold there is a T with screw off top.
With 1 pump running on "fill" at a time, I dumped 1 gal per pump into the T and let each pump suck 1 gallon into each respective ballast tank.
I then closed the T, and emptied each pump, pushing out the coolant. Seems to work OK.