Of course they want to upsell you, it’s often more lucrative than the original purchase. I’d skip their magic sealant and you can apply Scotsguard yourself.
You can get a lot of debate about extended warranties. They’re very profitable for the seller, thus the reason they push them so hard. My attitude is if I buy something new and on the leading edge of technology, it will have defects and may fail so I’ll at least consider a warranty. Otherwise I don’t consider them. With vehicles I just self insure – put the money in an account and use it for the repairs as needed. The odds are heavily in your favor you’ll come out ahead. I might waver on a MH, but on a TT or small FW I’d pass.
I think they’re mostly a peace of mind thing that people are willing to pay for. If you’re inclined to get one, get a copy and read the fine print like a lawyer. That’s where all the deductibles, caps and exclusions are that will reduce the coverage you think you’re getting on the surface. Keep in mind, too, you don’t have to buy at the time of FW purchase, you can buy later or from another source, and you can negotiate the price like anything else. Good luck and congratulations on the new FW.