And then this is the "Doh!" moment. Did all that work and no "humming at the wheels" when I pulled the break-away chord. Then I ran across idroba's post. So here we go sports fans, the proper way to test your break-away switch is......
Have at least one of the wheels off the ground. Disconnect the Airstream from the TV. You do not want the umbilical connected as this may fry the brake controller in the TV. Also, don't have it sitting on the ball of the TV, may give you a false ground reading. Disconnect from shore power. Now, pull the chord to the break-away. Go try and spin one of the wheels. Wheel should lock up within less than one turn. Now go have a beer and stick yer chest out knowing you're smarter than ol' Jim.