I designed and built my own cargo barrier and drawer system as there was nothing available after market for H3's when I did mine.
Started with the cargo abrrier to keep anything lose flying forward.
As the truck was really a 2 person tourer, I removed the back seats and used the original tie down points to bolt a base to.
Then welded up a frame from galvanised tube.
I made it in 2 halves to make it easier to take in and out. They bolt to the base and also to each other to keep it all strong.
The drawer carcas I had folded up at a local sheet metal shop
Then I covered everything with outdoor carpet, including the insides of the drawers to stop things rattling around.