Debra,
Welcome to the forum. As you can see, you'll gets lots of advice here.

Personally, we don't buy extended warranties on autos or RVs. Since I am pretty handy and have friends who have whatever skills I don't might not have I find I can fix most things; at least on RVs that aren't motorized.

As for ceramic coating - pass on it. It's just not worth whatever the dealer wants. You can find lots of folks who will wash and wax your RV when you need it for far less than you might expect. I think I pay about $200 when I have it done.

I'll offer one other suggestion.... before buying every gadget and accessory you think you will need, just go our a few times on a short trip and figure out what you actually need. Wherever you go you can always find just about any of the gadgets, features, accessories you really miss.

Have fun, travel safe.