The big advantage of the F16 is its weight (no I'm not trying to start that one again). It means that double stacking two boats on a trailer designed for one could be done easily as cat trailer are usualy one size fits all from the F18 to the rotomolded. Put one on top of the other using some high density foam and you're done.

I've done it with Wayne, stacking my Stealth upside down on top of his, using long wood beams and carpet to make some clearance between the two. The only issue was to get a mast support to hold two masts...