3k m/s in LKO STS system with interesting payload.
Be sure to use AG 0 - 9 to turn off engines in the middle booster during ascent to control the nose up tendency as fuel drains.
AdX Shuttle Type-XXLR - it'l like riding a truck along a bumpy road to get into orbit…
Slightly larger orbiter and enhanced lift stages.
Carry the Andetch modified VALENTINA payload by Space Pixel
Lot’s of action keys, you will need to learn how to fly both shuttle and payload. Can change the payload out easily enough.
A stock rocket called Sloh-Rye-Dah
VALENTINA. Built with 834 of the finest parts, its root part is strutCube.
Built in the VAB in KSP version 1.12.2.