Bought my first V - '73 cuddy - with twin 140 Johnsons hanging on a shoddy transom repair.  Motors weren't rigged and the boat was never launched with the twins.  I suspect it would've sank as it slipped off the trailer.  
 
Took motors off, had the transom repaired "right", rebuilt trailer and repowered with just one of the 140's on a jackplate.  Ended up selling boat/motors separately and buying my V21.