What Platinum said. That is how my king bed is supported, the 60 degree bend attach to the top of the box and the frame under the box. The two straight bars with pinched shut ends support the outer most part of the bunk. There are two brackets mounted to the underside of the bunk, one right and one left. Then you will find a couple similar brackets on the tongue, in the "V" section of the bunk. The poles are to be inserted in theos brackets.
I find it easiest to mount the pole in the tongue first, then you will need to lift the bunk with your shoulder or back to insert the other end of the pole into the underside of the bunk bracket.
TV: Any Chevy will do
2005 Jayco 1007 - 2007 - 2012
2010 Jayko 141J - 2012 -