Since your coach is on a stripped chassis more than likely it has the chassis OEM seats. In my experience with cars over the years if the seats are comfortable keep them and purchase new covers. In some vehicles I was able to change the covers without removing the seats on others the seats must be removed to get access to the underside of the seat bottom.
Another option is to find an automotive upholstery shop. A co worker of mine had some Suzuki SUV seats recovered for under 200.00. He did remove and install the seats himself.
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054