Hire Car with a towbar?

Cocodj

Hi there,  I would love to take our parents over to France with us this year but they wouldn't be able to drive themselves.  I am trying to find a hire car company that will do a seven seater fitted with a towbar and that will also let you travel abroad. 
We are staying at l'ans du brick and their chalets would be ideal for them to stay in.  Grateful of any ideas