Google "Maxxgard + forum". That should dissuade you. Just can't beat a good wash & wax along with 303 protectant. What could be in Maxxgard that is so superior?? Have they offered an undercoating job, lol? :R
We have a bit of fading along the top of our front cap. It might be partly due to to the cover rubbing on it over the winter so now I tighten it up as best I can. Gotta get out the oxidation remover soon when I do the first wash 'n wax of the season.
When we bought our TT we could have had an option for painted decals instead of the usual vinyl ones. 5 years later I'm starting to wish we had.
As far as an extended warranty goes, fuggedaboutit. If you read the fine print, things that rarely break and can be fixed by you are covered while things that are more at risk of breaking aren't. When some things fail, they will sic you onto the manufacturers like Lippert, Suburban to duke it out with. Take the $$ and buy some nice RV accessories instead.
What you definitely need to do is stay on top of maintenance, one of the most important being caulking to prevent leaks.
Our insurance doubled the length of the factory warranty but that period has now passed. Never needed to make a claim past the original 2 year warranty period. Most things that fail happen withing the original factory warranty period. Problem with warranties is that you have to take your RV to the dealer where it will sit for weeks and maybe in the peak of the camping season. Or something can fail on a long road trip while hundreds of miles from home. Get a few tools and learn to fix things.
Oh, and even if covered under warranty, some dealers are inept at fixing things. Ours just couldn't repair a few things, even after going back 2 or 3 times. Ended up fixing them myself.