One of the options for a future trip to Iceland is to go to Hirtshals (Denmark) by car to take the ferry. This will allow us to take our own motorbikes so we don't need to rent one in Iceland. To reduce the budget, we will take the motorbikes in our car (trailer) and will take the ferry without the car, only the motorbikes.
The question is: where can we leave our car with a small trailer in the city of Hirtshals (or sorroundings) for about 15-20 days? We have though in some type of long stay parking, maybe a camping where allow to leave vehicles or even leave the cars in a public (free?) parking if Hirtshals laws allow it and cannot found other option.