Billy,

The setup you showed is for a different purpose.

The ones in the photo are designed to allow the upper part of the truss to be swung down during transport, making the overall height of the transported modular unit low enough to clear bridges and overpasses.

When set up on site, the upper portion is swung back up into place and then mated with the other matching like truss from the other modular unit being mated to the first one.