Staferot

I know how to reload .lua files. Press F11, choose file from Lua files list and click reload button. But it will not work for situations when your code executes only once by OnGameStart event (for examle). I don't know how to reload another content of mod at runtime.

You need to decompile java class file: <game folder path>\ProjectZomboid\zombie\vehicles\BaseVehicle.class This class describe Vehicle object behavior.

In TileZed open edit->settings. Choose Zomboid tab and add your WorldEd file with buildings. After that restart TileZed. It's should help you. Maybe ...

Same error. Same condidions (game version, etc.). Player B change steam username. Player B can't use safehouse after that.

OnVehicleCollide lua event for detecting car collision with another objects (trees, doors, etc.)