>>16832425
>One designed to go into a fairing and can be paired with a kick stage inside that fairing if required.
I've done that dozens of times with in-line cargo bays in ksp, clearly this is a skill issue.
just push the payload out sideways so it's parallel with the launch sytem and fire the booster.
or simply angle it if you're in a videogame where aiming thrusters at your launch system is not a concern.