On the iPad and iPhone you can go to m.google.com/sync and add more calendars that are shared under your google account. Is it possible on the TouchPad? Is there a browser available or patch that allows changing of the user agent?
Actually, I think I found my answer. I used Exchange for my Google account with the server as m.google.com. I logged onto m.google.com/sync using the iPad and saw that it had a "Palm" device. Google apparently limits calendar syncing to only 1 calendar on Palm devices while iOS gets up to 25 calendars.