What should the tongue weight be on my 17.5' Tin boat?
It feels like its pretty heavy - probably about 180lbs. I am thinking of moving the axel forward one or two notches.
... It feels like ... 180lbs. ... What do you guys think?
I think you are really strong! 180lbs is a lot to lift for one person.
Remenber to lift/weigh it right at the Ball Socket.
If you lift/weigh it a few inches back on the tongue, it will be even more!
My trailer manufacturer recommends 6%. Some folks will say as high as 10-15% . Too much is probably safer than too little. A bathroom scale and a piece of 2X4 (cut to give same height as your hitch does) will tell you your tongue weight but you need an accurate weight of the boat and gear. Near me a metal scrap yard was the closest scale. My local truck stop has one as well.
I'm using 6% and it tows wonderfully and is easy to maneuver by hand off the vehicle.
It really is a two person ordeal, unless you really strain yourself!