because on most boats the engine is at the stern and that is where the weight is ..
because of this boat trailer axles are always further back than any other type of trailer .
the longer distance from hitch to boat trailer axle inherently gives more controlled weight .
I tow my boat and 3 other tournament boats because I have the best tow rig .
My 3 other buddies all have newer tournament boats but have wimpy tow vehicles ( compared to my duramax ) . Durango , 1500 suburban and cadillac suv .
I do most of the boat towing ( 46 miles one way to lake billy chinook ) and we load my pickup with 6 people and we put the extra skis , wet towels , wetsuits , extra cooler under my snugtop canopy which we can lock .
I drop the boat in the water with all the passengers already in the boat . i park the trailer and off we go .
we have a ski club dock where the course is and we take the extra essentials and put them on the dock .
many of the tournement boat owners own a blinged out suv and not a real tow vehicle . hence the need for light tongue weights .
On my boat trailer i moved the axle back about a foot .
this increases my tongue weight and also the controlled weight .
i sometimes tow very long distances and i can tell you that the modification to longer wheelbase ( and a size larger + load range tire ) makes for a very good handling combo for long distance towing .