garage height?

question for everyone I am installing a new garage door this week and was looking into raising the height because I hope to be buying a new boat this winter. I can raise it to a height of 7'6" without changing anything structurally to my opening. will this be high enough for most wakeboard boats in general with the towers down? or do I need to spend the extra money to get it to 8'? 8' would be as high as I coudl take it due to the roof trusses? any info would be great.
thanks