Even with bed liner it won't be long before you figure out it was a mistake to remove the carpeting. The carpeting not only keeps it from turning the interior into an uncomfortably loud environment on the highway, and the large amount of heat coming up through the floor from the main catalytic converter will turn it into an oven as well.I am having this exact decision. Trashed the carpet
For the bed liner, I strongly recommend either having it either sprayed in using a compressor and an appropriate paint gun or rolling it on with a paint roller. Don't buy aerosol cans of bed liner like Rustoleum sells, they clog up so badly you're lucky to get half the contents sprayed before it clogs. Many of my cans were still near full when they stopped spraying even after I started flipping them upside down to clear the nozzle with the aerosol gas between sprayings.