Firstly, what a beautiful build you have achieved over the last few months since I have been away Dom! I love every part of that ad I salute you sir
Just a thought for the figures: If you have done this then ignore me, but did you pin the figures to the model? I ask because knocks and bangs at any point between getting her into and out of the car, into and out of the water and occasional bumps while sailing might dislodge one of the crew (They'll strike for better conditions!!!)
For transportation, people often obtain or make a trolley that breakdown or fold up so it fits neatly into your vehicle. I have seen the metal four wheel trolley (I was recommended to get one with a car like steering as this is more stable around corners), one made with Wheelchair wheels and numerous ones with rubber wheels, shopping trolley wheels or other. Try and get a good balance between weight and strength.