I would say definitely no. Your trailer has a two year warranty from Airstream already. There is no engine or transmission to fail. The systems are pretty simple and for the most part robust.
I would use it a bunch, make a list of "warranty items" that need to be addressed, get those squared away in your first year(s) of ownership.
Many extended warranties require an "annual inspection" that costs $$$. Getting approval for a repair at any place other than the place that sold you the warranty can be near impossible.
It is pretty much pure profit for the dealership.
Sorta new (usually dirty) Nissan Titan XD (hardly paid for)
Middle-aged Safari SE
Young, lovely bride