More and more subprime loans are giving piggyback rides, carrying second mortgages with them from the time of origination. But investors have begun raising questions about the risks associated with those loans and the dearth of information provided by issuers. “Given the important implications of piggyback performance, we believe investors should ask for information on piggybacks on all deals and employ the ‘trust but verify’ concept when looking at deals where no piggyback seconds…