Just realized that the horizontal landing will be dangerous if if your fuel was low cuz the rocket will spin out of control so another recommendation to use the vertical when fuel is low
Advanced Control:
Turn the engine of the heavy and follow this angle
5/5
5/10
10/20
15/30
26/45
30/60
Then if the fuel of heavy is 30% separate the Ship and go to the orbit fast as possible
Then land the heavy for reuse
I recommend build the fuel station first before launching this...
ZK-SHIP is a Interplanetary Spacecraft that Carry's Crews and Cargo, also it has a horizontal landing and vertical landing it was inspired by Spacex Starship
Drawing before creation
Cargo
Crew
Heavy