The RV Extended Warranty.
Sooner or later something will break. That’s just the facts of life in general. Once your factory warranty runs out, you’re pretty much on your own. The biggest repair costs that are guaranteed are in consumables, like tires and brakes. No matter how well you treat them, they are eventually going to wear out. Proper maintenance of engines greatly prolongs their life. Appliances will usually expire before their time by failing to winterize or extreme conditions.
Extended warranties are not really warranties, they are service contracts. Emergency roadside assistance is probably your most valuable coverage and biggest lifesaver. Literally. Here are a few more articles on RV warranties.