Responsible for the polymerization of the main chain of the major teichoic acid by sequential transfer of ribitol phosphate units from CDP-ribitol to the second glycerol phosphate attached to the disaccharide linkage unit. Synthesizes polymers of more than 40 ribitol phosphate units in length. 4-O-[di(2R)-glycerylphospho]-N-acetyl-beta-D-mannosaminyl-(1->4)-N-acetyl-alpha-D-glucosaminyl di-trans,octa-cis-undecaprenyl diphosphate + n CDP-L-ribitol = 4-O-[(D-ribitylphospho)(n)-di{(2R)-glycerylphospho}]-N-acetyl-beta-D-mannosaminyl-(1->4)-N-acetyl-alpha-D-glucosaminyl di-trans,octa-cis-undecaprenyl diphosphate + n CMP + n H(+) Cell wall biogenesis; poly(ribitol phosphate) teichoic acid biosynthesis. Belongs to the CDP-glycerol glycerophosphotransferase family.