All the vehicle assets you may need come as zipmods (zipmods are assets, as in objects, particles, clothes, whatever, any visual shit - while plugins are functionality added on top of Neo2 like Node Constraints, HS2PE, VNGE, the object manipulator, Pose Loader, map tools plugin etc).
You can get more on discord, but one MASSIVE mod that I have for vehicles is the LeonardZ Toyota pack.
Making penetration scenes in studio is possible most easily for vaginal, anal and oral. You need to use Hooh's scripted dicks to achieve that.
You may animate the penetration using
- Clip Manager plugin (which is packaged in Visual Novel Game Engine VNGE and is available in the extra plugins folder in the default betterrepack download package)
- Pistons / rotators / scalers which are bound to body parts using Node Constraints plugin (available by default, hotkey is CTRL - I, you need to press it after rotating or panning the screen, it won't open if you press it after interacting with another plugin)
- default studio animations, though these may have penetration already modeled, I'm not sure
You can also use Dynamic bone capsule colliders from J694 (author username) constrained to the penis in succession, or maybe individually animated next to the private parts to achieve the same effect. This is much easier in my opinion, as using the scripted dicks is quite...convoluted.
You need to select the collider after adding it to the workspace and open HS2PE on the left and select only the desired bones to interact with the collider. For example, the "mune" bones are the breasts. You can also change its size in HS2PE and change wether or not the collision happens against the outside of the collider or against the inside (i.e. is the boobie being moved by an object or is the boobie not allowed to leave a certain spherical boundary)