[Rules] Transported units and stacking

[Michael Murphy]

I've been playing PG since 2001. I've always understood the phrase "Once loaded, the transport unit and everything it carries count as one unit for stacking, movement and combat purposes," to mean transported units effectively cease to exist until they either die (and create VP if applicable), or unload and re-assume counter form.

Added vulnerability is generally the going rate for using combat taxis.

Just my 2¢