That didn't answer the OP's question.
Short answer: NO. Only a manufacturer can provide a warranty. 3rd party policies are called extended service plans. MY DH consulted for a company that designed those plans for other companies to sell. They are available, but there's usually a 20-year cut off for RV age & often a mileage cut off (usually 100k).
You "may" be able to find a few (there are companies out there that offer plans for vintage cars), but I'm sure they'll be VERY expensive.