The piece of 1/4 inch plywood that was on top of the box was in two pieces vertically and stapled down the middle. This is supposed to hold two adults? The first time I thought there was a problem was when we started rolling to the middle.
I'm a big guy, my wife is not big, but she's not petite either. The first time the bed exploded it was when it tore from the wall. The second time it blew out the bottom. The plywood top was already bowing in the middle. I ended up putting a piece of 1/2 inch plywood over the top and building a 2x4 brace along the edge in front of the slide mechanics. That provided some support across the middle.
The second time it exploded it blew out the bottom of the box. I added corner brackets to beef that up. I'm not going through another season waiting for it to fail, much like my diet did over the winter. I'm either going to build a new box, probably lower to the floor so that our faces aren't at window height or investigate the box spring mattress frame option.
2016 Cruiser 315RL, it's a beauty!