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I think the more important reasons are to prevent the groceries from sliding around in the bed and to protect them from the sun and precipitation.
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Still see this in the ones with tonneau covers as if they intended to put cargo in the bed

But who knows maybe it’s already full of stuff under there

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Dang, if only someone made an everyday car with a soft weather proof enclosed cargo area, possibly you could have the tailgate open up and away as well so it's not in the way. I would think Americans would love to have something more practical than a work vehicle
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Another reason is to avoid letting the inside of the bed get scratched. I lived in Texas for a while, and people were that fussy about their trucks.
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So true! My Ram 1500 was purchased to pull our travel trailer. It has the tow package and is factory raised up some. I'm kind of old, so I keep a three-step ladder in the bed so I can easily climb into it.

Because of the poor gas mileage, I always wonder at why people drive these gas guzzlers as their main transport. But each to his own. (BTW, some claim safety, but it's probably fashion.)

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The safety aspect is intersting. The driver might be safer, but they are vastly more likely to kill anything they hit.

https://www.lshtm.ac.uk/newsevents/news/2025/being-hit-suv-i...

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