The Kokusan 2K-3 has no separate small winding for DC. There are two output windings and a common that is referenced to the stator frame(motor/chassis). The 2K-2 has just one smaller 35W output winding. A DC conversion is just like building a linear DC power supply from a transformer, bridge rectifier, filter, and regulator. The Trailtech module just integrates these components except for the filter as the battery takes its place. In either case the DC output is isolated from the AC input to the rectifier. If the grounds were connected, one pair of diodes in the bridge would each be shorted, one during 0-180 deg (+) and the other during 180 - 360 deg (-) of the sine wave, bypassing the DC system load.
So you are isolating the grounds. If you choose to have a DC chassis ground then it must be done with the stator mod. I'm pretty sure the white and yellow outputs are out of phase (different poles) and not just a center tap type arangement of a single winding. The term "Floating" the AC ground or removing its reference to the chassis is just a way of saying "Isolating".
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