I didn't see a weight given in the TM section of the 2009 FSM, but maybe this will help your search:
Transmission type: FS6R31A
Edit: According to
http://www.autozone.com/autozone/par...470686_0_42659, 130 pounds.
Edit 2: That's probably dry weight with all "accessories" removed. I'd add at least 70 pounds to that figure, just to be on the safe side.