Where can I sit in a camper?
The rule came into effect on June 3, 2018(in Belgium - check out for your country) and is valid for recent vehicles registered after October 29, 2013.
Anyone who fails to comply with the sticker obligation on seats( that you are not allowed to sit on while driving) has a fine and risks re-inspection.
In the absence of a valid sign, a green inspection certificate with a limited validity of 3 months will be issued. A re-inspection must then take place within 3 months.
Every valable seat needs seatbelts.