So how much water can the hull take in from the aft rudder lines? Do you mean that with the extra weight the stern will be underwater all the time???
.That is scary. Can you give me one more advice? Should I carry with me extra rudder pins and a water pump? What about those aka plastic screws? Are they important to carry onboard?
I noticed those aluminium Hakas build by Abisail12. He can sail very comfortably with two onboard. I think that this is a very good idea. You can sail, lay down and you do not need to use tramps.
I have seen AI hulls half flooded with 2 people aboard and the boat was not sailable, so you never want to let things get to this point. I rescued the heavier passenger on my tramps and then we had to tack upwind through a narrow channel and surf. It was very difficult crossing the wind.
When the stern is submerged for long periods due to too much weight, it can fill the hull very quickly. At that point, the AI stops being a sailboat and becomes a submarine. It will do what the waves and current tell it to do, rather than following the sail and rudder. One person can still guide a flooded boat to land if they are skilled (although it will be too heavy to lift) but if 2 are aboard, it will drift and flounder.
Tramps distribute the excess weight better than the Hakas and are a safer, more comfortable choice for your passenger. The next best thing, in my opinion, would be your lady on the tramps and you on a quarter deck. Her weight toward the front and yours toward the back.
All this will make sense when you try it, so don't worry too much now. Just learn to sail poli kala by yourself before you take her out.
And watch out for pirates.