So, I was always wondering that if SCS could add this cabin lights as a feature or upgrade to the trucks in game. Ever since. I started playing ETS2, I kept wondering that why doesn't the cabin lights work like in real life when we stop the trucks at a resting place or take fuel it would be a good addition and a touch of IRL in game there are few cabin mods that work as cabin lights but not properly as a cabin light would. So it would be a nice touch of they add this feature to the game. The only interior light that has in game is in the Scania S series with the Red light bits. So hopefully SCS would add this small feature to the game.