I don't know how it is called, so let me describe it:
In Europe DIN size radiosets used to be equipped with a sleigh. (Before the time that frontpanels could be taken of)
It was a kind of box with a connector that fitted into a frame that was mounted into the dash. This way you could easely take your radio with you out of the car.
Does something like this exist for the mini-cases for the carputers?
A bit like laptops sometimes do have...