Steve, with the bunk brackets that you have, you would need another set, I think three per side, depending on how many cross members there are. You want the two center bunks to be the major support and run the entire length of the keel just short of where it starts to turn up. Then the two outer bunks to be shorties. I used the same brackets you have on, on my Kona trailer.
Here is a pic of the Advantage, but you get the idea. Good thing about your brackets is, they are adjustable.
