Be careful if you plug both cords into one 30 amp outlet, the aft air conditioner draws a lot of juice on start up, which is why I had a dedicated cord set up for it alone. If you are going to run that aft ac, it really should have its own dedicated 30 amp outlet, or 1/2 of a 50 amp.
The boat is currently plugged in to a single 50 amp that is split into the 2 30's. I left you the 50 to 2 30's splitter,
My guess is that St. Marks will have 2 30 amp outlets available for you.