towing capacity of 05 Gulf Stream B T CRUISER 5211?

GS called me back - awesome customer service. She is built on a 3500 1 Ton GM Chasis with a 6.0 L V8. The GM specs show 10-14 K GVWR whereas GS advertised 12,300 for with the GM option. According to the GS rep, the GS limited the towing capacity to 3,500 lbs. So the question remains on how this coach will do towing. Who tows with their BT Cruiser and how does she do?