It's called a Bed Rug found here -
Bedrug. They are custom made for the bed of the truck. The stick using heavy duty velcro to the inside of the walls of the bed and in my case the tailgate as well.
Yes above the driver's side wheel well is my solar / electric DIY section. The 100W solar panel is on the roof of the cabin, then into the bed connected to the 30AMP PWN solar charge controller to fuse box to 100AMP AGM solar battery to 1000W inverter.
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In this picture you see the solar cables coming down from roof of cab in-between the rear window then into bed of truck. Black bag on the floor is where I keep the battery.
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