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When you rate the trailer and tire to carrying capacity, it includes everything (axles, fishing gear, the load you are carrying, etc...). You have a little leeway with tongue weight, which transfers some of the trailer weight to the rear axle of the tow vehicle (with your small set up 300lbs.max. probably a bit less). Check with DMV in your area for weight requirements for brakes on axle. In CA it is 1500lbs. I am not familiar with your hull but I would put off the trailer rebuild until the next time around and weigh your trailer and boat together at some sort of scale (quarry, landscape supply, weigh station, etc...) and take your guess factor out of the equation. I would get the correct spring (not overbuild) but get the largest tire/rim available for the axle hub.

Garris

If I had the exact weight for my boat and trailer I would keep the tongue weight out of the equation for wiggle room for adding weight to the boat. The tongue set up should be just heavy enough to be hard to lift or more.