Try it for yourself, 1 person is fine however I wouldn't recommend it for 4 people and if you read the article they said 'people' not person.
Also check to see how much weight your truck can hold. I'm sure 1 mer wouldn't weight that much...
Also line the bottom of the truck with some sealant to make sure that the water doesn't end up leaking out, I would always double line.
Its definitely doable.
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