Robert; Why don't you get a large 16x24 inch weatherproof box and mount a smaller 8 circuit panel inside, then install 6 circuits with 15amp gfi plugs inside. Feed the panel off your exsiting ac plug with soow cable and male cord end. Just make sure you have 240 volts plus a neutral at the ac hook up. Sometimes electricians will run a 3 conductor to the ac even though you don't necessarl need it. This is roughly what I have done.
PS I am a journeman electricain so it maybe easier to do it than to try to explain it.
I can send you a few pictures if that would help.