What about a solar sail vehicle powered by lasers to transport in Earth orbit cargo to Lunar orbit and back again. Landers could then transport the cargo to the lunar surface. It seems that the Japanese solar sail that is going to Venus is working fine and provides a good test bed for the technology. Lasers pushing on the sail would greatly speed it up and make it a practical transport option. I could see a vehicle similar to say Orbital's Cygnus cargo module being fitted with a solar sail and pushed along with lasers.