If not bottom paint, what?
I think you would be better off with Emeron on the hull because if it gets chipped you can sand and repair that area. Algrip is not very forgiving paint it is very brittle and hard to feather and touch up. Also I think you will find that Interlux makes a white bottom paint I THINK? I have seen it and it looks great just make sure it is trailerabul bottom paint.