I believe he is correct about the suitcase. In SC with a permit you can have you gun on you concealed. Otherwise or without a permit it must be either in the glovebox, console or trunk. If you do not have a trunk it must in a case in in the luggage compartment which is defined as the area behind the rearmost seat, primarily for SUV's. The back seat of a car or SUV does not meat the requirements whether or not it is in a case or luggage.
The permit only covers on or about your person and must be concealed.