You have to remember who put the video out there. They are as bad as politicians. They will spin it in their favor every time. Look at the difference in how the tool box bounced in the two tests. It looks fishy to me.
The hitch should not be mounted to the bed. It should be mounted and supported by the frame. If your hitch relies on the bed I would look at replacing it with one that has underbed system like the pucks.
The test if flawed or not who cares.
I don't see any landscaper around my HOA hauling blocks in there Chevy or Ford. They use a landscape trailer as they unload using a bobcat. Who is going to hand bomb a ton of stone all broken to bits.
B and B
2013 Rockwood 8289 Diamond Edition
GY D's/2.5 inch lift kit/Powerhouse 4 KW EFI Generator
2016 Ford F 350 Lariat Power Stroke Diesel Crew Cab FX4
2008 Golden Falcon 380PA Park Model Model "Oh Canada,True North Strong and Free!"