Rental Car Help

Hello all, we are planning our annual visit for a week in late June and are having difficulty in securing a vehicle to rent. As there are 6 of us, 2 adults and 4 small children, we need a minivan or similarly sized vehicle.

Is there something going on at the airport that has caused the onsite rental agencies to close?

Europcar's website will not provide a quote for the airport location, Hertz's site ( I'm aware of the CC problems with Hertz) says we can not return the vehicle to the airport location, other agencies don't show anything larger than a sedan.

Also, if anyone has any insight on how to save on a minivan or Suburban type vehicle your insight would be greatly appreciated.

Thanks