drop down trailer. location of wheels.
I built the frame then took a 2x4 and put it underneth and moved it until the frame balanced on the 2X4. I marked where the 2X4 hit on the frame and that is where I put the wheels. You do not need to worry about the pivit point is (I am asuming this is a drop down) just where the wheels are.
Mine balances to well and has almost no tounge weight. If I was to do it over I would have more tounge weight as it bounces all over going down the road.
Hope that helps.