Protein-arginine rhamnosyltransferase that catalyzes the transfer of a single rhamnose to elongation factor P (EF-P) on 'Lys-32', a modification required for EF-P-dependent rescue of polyproline stalled ribosomes. dTDP-beta-L-rhamnose + L-arginyl-[protein] = dTDP + H(+) + N(omega)-(alpha-L-rhamnosyl)-L-arginyl-[protein] Adopts a GT-B fold and acts as an inverting enzyme that converts the beta-configuration in the dTDP-beta-L-rhamnose donor to the alpha configuration in the N-linked (Rha) arginine product. Belongs to the glycosyltransferase 104 family.