wes,
picture 3 looks like a two piece(hat truss) truss. with a steep roof with a wide span the trusses are too wide to haul on the road so they are made in two parts. the main section gets 2x4's nailed to the top cord for the hat truss to attach to as shown. sometimes strapping is used to connect the top cords together and you will see a requirement for roof sheeting to be split on the joint of the two trusses.