There would be a choice of engines with different liquid rocket propellants: 1,200 kN thrust LOX/kerosene engines or 500 kN thrust LOX/LH2 engines on first stage and boosters.
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For example the space shuttle external tank holds 616,432 kg of liquid oxygen (LOX) and 103,000 kg of liquid hydrogen (LH2) while having an empty weight of 30,000 kg.
The Rocket Racing League is utilizing a highly modified Velocity XL FG airframe and an Armadillo Aerospace 2,500 pound thrust liquid oxygen (LOX) and ethanol rocket engine in both its Mark-II X-Racer and Mark-III X-Racer demonstration vehicles.
Krytox is a fluorether-based vacuum grease, useful from -75 to over 350 °C, not flammable even in liquid oxygen, and highly resistant to ionizing radiation.
Mary Sherman Morgan, inventor of Hydyne, which was combined with liquid oxygen to propel the first US rocket into orbit (1958)