I had a Skipjack 20 powerboat, trailer and boat about 4,000 lbs.
Trailer manufacturer recommended 10 to 15% of total to be
on the tongue. I weighed the tongue weight at a truck stop
scale at about 400 lbs. The hitch was frame mounted with
everything tight and secure, on a Ford F-250 long wheelbase
pickup, towed perfectly with little effect from side winds or
passing semis. I have read not to use a load compensating
hitch if you have surge brakes.