My trailer will seporate at the middle the lower part is a flat bed trailer looking something like this

I could run staps over the upper body of the trailer like you see them do with flat bed trucks.
I was thinking of some sort of latch. The walls are made of 2x4 pine I do have metal in the middle like the spine on a human.
I have thought of spring latches, ties from base of floor of upper body to trailer.
It is called the Box Kite so I could use heavy colored Rope and make it look like it is part of the image (going over the top and running town to the tung).
I probably have confused you as usual for me but I am a loss for words to explain it any farther.
I have pictures but am having technical difficulties and can not get them into this computer (working on it) to show you yet.
Ron Dickey The Box Kite Kid.