In august "Spaceflight" (from the BIS), there's an article about very heavy launchers.
The idea goes this way: 90 feet wide at the base (with 20 RS-68 Engines), a 83 feet diameter liquid hydrogen tank; on top of it, a 56 feet diam. liquid oxygen tank and on its top a 20x86 feet 300 tons payload. The rocket measures 266 feet in height.
It's a Single Stage To Orbit Rocket.
Problem: who is ready to think big????
Upon thinking big, everything becomes simpler: SSTO because with increased size, the weight of the propellant rises as the cube function while the structural weight for tanks, etc, rises roughly as the square function. The high propellant mass fractions necessary for SSTO are attained by building big.
The technology is in hand.
Because the favored way to reach the Moon was the Lunar Orbit Rendez-vous option, requiring a rocket, a spacecraft and a lunar module where every single gram counted, the risks of failure where huge. Very little margin for error, hardly any redundancy, no confort, no long stays on the Moon.
With ULLV, the cost per pound into space drops to $300.
And Mars can be reached much more easily too.
I can't find any link on the Spaceflight article written bya Edward Hujsak. Maybe his idea will inspire others.

Raoul