http://www.triumphtwinpower.com/triumphbonnevilleamericaspecs.php

GVW should be posted on the vehicle data plate. Subtract your bike's weight from the GVW and that is the total capacity (allow for gas, oil & accessories also). I thought the above site gave the GVW spec, but it does not.

There is a vehicle blocking access to my bike in the garage at the moment, or I would simply look at the plate & post it (07 SM).