My Summer Car – Hayosiko RV, camper modification

On the internet, you can see a screen from the game showing Hayosiko as a camper, RV. Inside, you can see a space where you can spend time, most likely there is a tourist stove, a refrigerator, a few cupboards, a toilet, and a bed.

Is Hayosiko RV (camper) available for download somewhere? At the moment, the modification is most likely in the development phase, but you can see the already made camper model. So the modification is not available to the public and cannot be downloaded from any site.