Insurance for park owned mobile homes

I purchased a mobile home park with seller financing in S.C. The homes are old and have been retired with the land. The seller is asking for me to provide P&C on 3 of the trailers that are dated 1980 and 1981. Am I able to get P&C on trailers without a title? Anyone know of any insurance companies that I may contact? Your help is greatly appreciated. The titles to all the trailers have been retired.