Hmmm. Most states require a red flag or cloth on anything sticking out more than 3’ past your vehicle's rear bumper, like plywood. Has this video been approved by Slate’s legal team?
5' truck bed combined with 8' plywood = less than 3' sticking out past the truck bed (and the rear bumper adds even more cushion). I'm taking your word on the "3 foot" requirement.
In Georgia it is 4 feet. I have never hauled plywood like this. Always with the tailgate down. Cool that it can sit like that without getting interfered with by wheel wells. If it was thinner plywood, say 1/4 inch, perhaps would have bent badly. I hope the do they Maverick 45 degree position with the tailgate.
It’s just good practice to place a red flag or cloth behind the plywood. If it helps avoid an accident it’s worth the extra step. Most lumber yards and even Home Depot will advise to use a flag when hauling overhanging lumber.
In the event overhanging plywood does cause an accident involving property damage, you’re likely going to be at fault if an insurance claim is filed.
Most pickups will take some cross 2x4s in the bed so you can lay it flat. Yea, it'll stick out. But that's what tiedowns are for. My Maverick can can do better with a shorter bed. Movable cargo management system. And the tailgate comes down halfway to further support the load.
This video is clownish. Taken by somebody who knows squat about owning and using an actual truck. I hope the rest of the company has a clue.
Good times! About a 5 foot bed? Maybe 6? That's what my 95 Nissan had. Among other adventures I moved across the US with it. I made a bed cover out an old plywood sign that used to advertise new apartments that I couldn't afford. Not unlike the signs in the vid.
The bed does have slots where you can put 2x6 boards to support a flat sheet load, loading that way has been shown previously. Of course always use tie downs if you will be moving at road speeds, a gust of wind can put a lot of lift on your load.