Maximun Load For V-20???

Hello Everybody,
I thought I might be able to find out some info from you guys on my wellcraft v 20 steplift. I am a commercial salmon fisherman on the north coast of California,

It seems most of these little boats are inland ,,, I dont see many on the coast here,,,

what do you guys figure the maximum load is,,, grant it sea conditions mean everything,,,,
I have an external altenator kit on the boat and aluminum house,,,Merc 470,,, also outriggers etc,,, gurdies,, hydraulic pump,,,, I have got rid of all the little extras to lighten up my boat,,, I figure I have 500 - 700 lbs in the boat after the factory built it,, I never fish with more than 2 people,,,, counting myself,,,,

what do you figure the hull payload is?
someone must know?
thanks,
Mike