trailer set up

[WillyC]

Hello guys,
I'm in need of some measurements for setting up a 20sf on a dual axle trailer. I am rebuilding an old double axle aluminum bunk trailer and will be remounting the whole axle and spring set up. What I am looking for is two measuremnts. One is from trailer hitch to the approximate center between the two axles. The second is the distance from the bow stop to the approximate center between the two axles. When I bought this boat and trailer it just seemed like there was way to much tongue weight. If anyone has a perfectly set up 20sf on a double axle trailer that could grab a few measurments for me I would greatly appreciate it. Thanks -will