Enables (R)-carnitine transmembrane transporter activity. Involved in (R)-carnitine transmembrane transport. Located in basolateral plasma membrane and cytosol. Human ortholog(s) of this gene implicated in Crohn's disease; cardiomyopathy; inherited metabolic disorder; and systemic primary carnitine deficiency disease. Orthologous to human SLC22A5 (solute carrier family 22 member 5). [provided by Alliance of Genome Resources, Apr 2022]