Mounted cab today and created firewall to firewall brace. The 46 metal is incredibly thick. I was able to use original holes the mount a piece of angle iron to the truck. Then I welded the bracing to the Prius firewall. The lower brace attaches to a solid bracket that Toyota used as a structural support. The upper brace attached to solid sheet metal near the top of the firewall. I believe this will be adequate support.