The Harborstone Credit Union is a auto loan from Harborstone Credit Union. The ongoing APR is as low as 7.59% APR. Loan terms: term set by collateral year and loan amount. Trade in the constant repairs for a ride that actually gets the job done. Whether you're upgrading the daily driver, buying an RV to be your mobile living room or saving cash by ditching a high-interest bank loan, we make the money part easy.