Extended warranty contracts aren't "insurance", but they get that lable anyway. The contracts are sold on products ranging from refrigerators to motorhomes and they are extremely profitable to the companies that sell them. You'll not find an INSURER offering the contracts, tho (having been in the insurance game for 55 years) I would suggest that warranty contracts are sure to provide a much greater return than casualty insurance provides.....that is, return to the company providing the product, not the buyer.
The contracts are worded to cover specific problems and then, only when accepted and authorized by the warranty company.
Reluctantly, I confess that I, too, purchased a 4 year contract on my coach. I'm an insurance broker and I believe the odds of benefiting from such a contract are very unlikely.