I did just as Wouter explained. My only difference is I tied a line under the tramp going from the front crossbeam to the rear crossbeam and the blocks are running through that same line. The lines serves to hold the blocks in place and as a tie off point for the bungee cords.

I also run four independant trapeze bungee cords, this is like a backup system. If I lose the starboard trap I can still trap out on the port side because again, they are all independant.