This sliding collapsible bed system made out of 80/20 aluminum extrusions is super strong. It's designed to slide into itself revealing an extra 25% of space in the van. In my case I'm going to use the space for a shower.

Product Links:
Plusnuts https://amzn.to/36FvEtf
80/20 Aluminum Extrusions (make sure to get 97") https://amzn.to/2RZNx26
80/20 Drop In T Nuts (the BEST) https://amzn.to/2YRvWL6
80/20 Linear Bearing https://amzn.to/2PPCJ3W
80/20 Bearing Pads https://amzn.to/36Kt2dY
80/20 Inside Corner Bracket (10 pack) https://amzn.to/2Z1FmUs
80/20 Double Width Extrusion https://amzn.to/2rULRMt

Tools:
Miter Saw (For Cutting Aluminum) https://amzn.to/2qUnpdE