For the wall supports I used 1.25 square tubing with .065 wall thickness. And for the ceiling supports I used 1 inch .065 square tubing.
Before installing the beds and cabinets we needed to create a system in the van so we could connect and hang the beds from the wall and ceiling. I purchased multiple L-track rails from Cargo Equipment Corp. Then I designed and installed additional structural reinforcement on the ceiling and walls for attachment points.
Here is a ceiling support that runs from the front to the back of the van. This notch in the 1 inch tubing was made to fit up against the existing van cross supports on the roof of the van.
I then used 20 gauge 0.048 sheet metal and bent the sheet metal to create a foot that would attach around the van roof supports. This gave me plenty of space to install rivets to secure the ceiling braces to the van body.
I also welded pieces of flat bar steel to the 1 inch tubing as anchor points for the firing strips that will hold up the tongue and groove ceiling.
Testing out the bed after installing the ceiling and wall L-track. The design worked great and with all three of us on the bed we didn’t notice any flex in the roof.