I have never bought an extended warranty in my life.
Either it works out of the box, or it doesn't. Extended warrantees were invented for the sole purpose of generating another income source for the dealers.
One big exception that comes to my mind is tablet computers and cell phones. Especially if a child is using them.
I went in to trade in our dropped ipad with a cracked screen for $50 (they just give you a brand new one, up to twice), and while I was there another guy was out $350 for his phone that he had somehow gotten wet.
And we certainly have no problem paying the fee for the Good Sam Roadside Assistance, especially with our 24-year-old RV it has been a life saver for us.
If I was spending $50K on an RV an extra $1000 for an extended warranty might be worth while. I'd have to look at the details.