[funfinder4]

Originally Posted by tomhole

...If it is a boat, you can get away with a lot less hitch weight. 7-8%. The boat is aerodynamic and tends to act as a restoring moment thus preventing sway.

If it is an open trailer with a car on it, that's similar to a boat and you could get away with less hitch weight, maybe 10%. Now you can probably get by without a WDH...

This is a common miss understanding of why boats have less hitch weight and still tow well. It has nothing to do with aerodynamics. It's the percentage of overhang past the trailers axles. The further rear ward you can move a trailers axles the more resistant to sway it will become.