No, absolutely not. Don't fall for the upsell. Just google "RV extended warranties worth it?".
Make sure you get your TT into the dealer before the expiry of 12 months and make sure you go over it with a fine tooth comb. If you have an ongoing warranty issue in the first year that remains unresolved, send it to the dealer in writing so you have some recourse. We had brake issues on our first TT that took over a year to fix and a complaint in writing got it done in the end.
Something like Coachnet is good, but otherwise, keep your money and put it into some nice RV accessories.