I am trying to decide how much engine I would need to suit my purposes. I have a Saturn 11' inflatable that will be used a tender. The transom plate states 15HP max. I am thinking 4-6 HP should be sufficient. We do get some winds and currents. Weight is a concern also. Is the extra weight and cost of a 4 stroke really worth it? I am currently considering a 2 stroke Tohatsu. Thoughts, opinions?