Trailer questions

[SkunkBoat]

There is a 10% tongue weight rule too. tongue weight 10% of loaded trailer weight.
In theory, you go to a truck scale and weigh your whole rig, subtract your tow vehicle to get your loaded trailer weight.( I don't know anybody who ever actually did that..) or guestimate...V20~3000 lbs

Use a bathroom scale under the tongue at hitch level. Then adjust the boat forward or back to get 10%. ~300 lbs

Definitely put a keel roller on the forward and rear cross member. Otherwise, on a steep ramp the bow will smack the trailer as it comes off.