Originally Posted by troyslegacy
I have the hardware to drill into the truck floor. I'll probably just end up doing that. I was concerned that the plywood would bow up when I tightened the straps down, eventually crack, and then I'd hear a nice boom in the back of the truck as I pull out of McDonald's.
You could beef up the ply wood with some 2x4s or 2x6s.
Laying it on its side may crack the crashbars. All those bumps and vibrations will be absorbed by the crashbar and transferred to the mounting points.
Picture from the web.