I also just bought a new 2018 Landmark Oshkosh and was offered a product called Enviroshield. Again covering the similar items you stated. The quote given to me was $895.00. I passed on it myself personally but to each their own. I guess I didn’t see the value even though it was for 5 years which per year isn’t all that bad but there are only so many dollars to spend.

Good luck on you decision.

Its up to you, but personally I could purchase a lot of Scotchguard for upholstery, cleaners and polish for that price! You'll need some "elbow grease' and energy to perform the labor though!