Thank you for that data sheet.  I had not discovered it before.  It contains one piece of info that is new: the temperature rating is 85°C.  That means, by the ABYC chart, that its current rating is somewhere between 15-23A.  I guess the system really is designed for 16A shore power.  I have been overloading it... all the more reason I need to upgrade!  I apologize to anyone who I misled with my incomplete information.

Thanks,