Oem rubber mat and a couple of carpet door mats for when camping. I have no qualms drilling or putting screws into the floor since it is composite it’s really easy to fill the holes back in with some black epoxy
The BedTred Impact Truck Bed Mat - Trucks w/ Bare Beds or Spray-In Liners - Thermoplastic is what I decided on.
I have it in my Ram Pickup and use my truck for work. I was concerned because it is a hard surface and I wear shirts but it doesn’t hurt the knees because the surface is flat and the underpadding is great.
Also if you get water in the bed it will go under the pad not on top. I just keep the front factory bed drain holes clear.
If it gets to dirty just take it out and wash it and you are ready again.
Hint: On a cold day lay it out on the driveway to heat it up. After it is in the truck it will flatten when it gets hot. I did not use the tape anchors that cam with it.
Full Bed rug also helps mitigate dust intrusion, which is nice
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