That should not be a problem, but let us think of a special traveling case.
If you travel from norway to germany by ferry you are adviced to have roaming of because
on the ferry they have a special maritime/sattelite net which is very very expensiv.
As long as the car sleeps an the sim is not active it would not be a problem, but if it
connects to it you are getting a bill afterwards you won't like
So you are adviced to have roaming off during ferry time on that travel