NEW YORK–(BUSINESS WIRE)–Kroll Bond Rating Agency (KBRA) assigns preliminary ratings to six classes of American Credit Acceptance Receivables Trust 2018-4 (“ACAR 2018-4”), an auto loan ABS transaction. American Credit Acceptance Receivables Trust 2018-4 (“ACAR 2018-4” or the “Issuer”) will issue six classes of notes totaling $233 million that are collateralized by a pool of retail automobile contracts, made to subprime obligors and secured by new and used automobiles and motorcycles. The stru