So I have a 7'11" Mercury Inflatable. Transom supports up to 5HP. I was wondering if anyone could share experiance with a 8ft inflatable and HP sizes. Was looking at the 2.5HP and the 4HP but really am hoping the 2.5HP is enough. Just not sure..... Thought of the 4HP in case I ever upgraded inflatables but it is almost twice the cost and I really don't see needing a bigger inflatable for awhile.