Truck bed carpet kits were very popular in the 1970s and early 1980s and there were a lot of manufacturers making them. They fell out of vogue, as they say, and yet there were still a few who continued to make them.
Recently there has been a resurgence of interest and demand for the carpet kit because it is still quite useful depending on how you use the bed of your truck. They are made of automotive style carpet with plywood frames and padding and are meant to be used inside the bed that has a camper shell or truck cap so that the carpet stays dry. It can be made into a bed or sleeping quarters when needed as well.
Deluxe Carpet Kit by Rugged Ridge®. Replace your old, worn, threadbare, mildewed carpet with this Deluxe Kit from Rugged Ridge. It's made of polypropylene for durability and resistance to chemicals and mildew, and custom designed and precut to ensure perfect fit. The Kit comes in your choice of colors, with or without adhesive.