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I don't see a weight problem if the container is empty.
From
Dry containers 20' and 40' for general purposes | DSV
20' dry container ...................40' dry container
Tare weight
5,071 lbs............................ 8,268 lbs
I think he has a wood dowel linking the 4x4 to the stinger though it also appears the 4x4 is just supporting the tailgate which for some reason is holding up a gooseneck hitch.The chains assisting support of the tailgate look way too light but look at the S-hook at the end of the chain! Those are so light you can bend them with pliers! Then the S-hook engages a hole punched in the sheetmetal. One bump and that's going to disengage. Is that a wine cork 'securing' the wood block to the car's stinger?