Catalyzes the transfer of CDP-abequose on D-mannosyl-L-rhamnosyl-D-galactose-1-diphospholipid to yield D-abequosyl-D-mannosyl-rhamnosyl-D-galactose-1-diphospholipid. alpha-D-Man-(1->4)-alpha-L-Rha-(1->3)-alpha-D-Gal-di-trans,octa-cis-undecaprenyl diphosphate + CDP-alpha-D-abequose = alpha-D-Abe-(1->3)-alpha-D-Man-(1->4)-alpha-L-Rha-(1->3)-alpha-D-Gal-di-trans,octa-cis-undecaprenyl diphosphate + CDP + H(+) Bacterial outer membrane biogenesis; LPS O-antigen biosynthesis. Belongs to the glycosyltransferase 2 family.