Sec 29-28 subsection e
allows an individual or group who control a property to determine if ccw is allowed there.
That being said if they choose to make it a gun free zone and you are made aware of this, then it is legally enforcible, however it dsoes not say if it is a felony or misdemeanor.
In those cases I unload and use a cable lock to affix my pistol to the rails under the driver's seat.
It is not against the law to keep it loaded in your vehicle, but that is what I do, just in case something happens and I have not readily armed a criminal. This way I can feel confident that I took reasonable measures. Perhaps it is a feelgood precaution, but it does just that, makes me feel good.
This is my rifle...