Actually I don’t use poses in cars because I don’t like posing my sims and I try to avoid it whenever I can…so I came up with a solution:
1. What you need: Sims 4 Studio and a CC car (the police car I used can be found here). You don’t need any modding experience (God knows I’m useless at that).
2. I used Sims 4 Studio to remove the footprint of the car. I don’t know ANYTHING about modding, but this is super easy. You just need to follow this super short tutorial. By removing the footprint, sims can basically walk through the object.
3. Once the footprint has been removed I go in game. I just place two stools where the car seats are…and voila! Sims can sit on them and interact normally! 😀
Pootaint 