FYI, there are NO wall studs to anchor the screws into. I put numerous 1.5" fat screws through the 1x2 at the headboard along with 4" L brackets attaching the headboard to the side boards.
If you are reinforcing the sideboards to the moving flooring I would not use any screws longer than 1/2" so it does not penetrate through the moving floor.
I also added additional wheels to the foot of the bed.
https://www.montanaowners.com/forums...t=slide+wheels. #26