I would assume that the boat couldn't be loaded forward enough to get the
proper tongue weight without adding length to the front of the trailer.

--
JerryD(upstateNY)

Serious questions coming up: How does a power boat trailer differ from a
sailboat trailer; isn't the "downward force" known as "tongue weight;" and
why could not the boat (whether power or sail) be repositioned on the
trailer so as to provide the (presumably) requisite tongue weight
regardless of type of load?