Eric,



Careful on flipping the trailer to lower the boat, not a good idea, I raised my boat 4" up from the trailer!



Unless, maybe your new F18 is like a supercat 17, no dolphin striker?



You need clearance under your dophin striker to git a box of any size under it.



Whew, lowering your boat on the trailer, next you'll be adding an air damn and ground effects. How fast you gonna pull that trailer anyway? The slightly higher center of gravity isn't a problem with rolling the trailer on the road, it's not that heavy. A wooden box like mine also puts a moderate amount of weight down low, the usefullness of the box, both inside and outside(tabletop, sun deck, etc.) far outweighs the weight. Pun there, huh. HOw do you outweigh the weight?

Carl, nothing sits on top of my sails in my rather large box!