I'm going to have to draw this, But I've seen jack-knife style stabilizers before. A 12" piece of steel hangs from the frame from a hinge. Attached to this piece of steel is a 12" piece of steel, hanging from a hinge. At this point, you have a double hinge. On the frame member, running from the hinge-attachment point towards the front, there is a third piece of steel with well defined knotches every 1". When the trailer is relatively level, the 16" piece of steel swivels upward and locks into the appropriate knotch, creating a triange. The trailer rests on the middle hinge. If designed cleverly, the whole thing can fold flat against the underside of the frame during transit. It can also be designed such that the free end of the double hinge is permanently attached to the knotched area rail.
Got it?
