Replacement carpet

For an '06 Keystone product the OEM will have exactly zero materials left 10 years later. On a slide, carpet is very easy to replace but that carpet may extend under any molding. If that is the case, take your time and just cut it free then install the replacement right up to that molding. As the previous responder noted, use staples for attaching, use the removed piece as a template then go to work. Any carpet you find at a rug store will probably be better quality too. Inexpensive staplers, good for handyman use are available at any Harbor Freight along with inexpensive pancake compressors.