Trans-Golgi-associated GTPase that regulates protein sorting. Controls the targeting of ARL1 and its effector to the trans-Golgi. Required for the lipidation of chylomicrons in the intestine and required for VLDL lipidation in the liver. . This is the function of ARFRP1 (ARF related protein 1, Ensembl gene identifier ENSG00000101246).