Tennessee State Parks: Policies
States:
In park, natural, and historical areas the use of traps, seines, handthrown spears, nets (except landing nets), firearms (including air and gas powered pistols and rifles), blow guns, bows and arrows or crossbows, and any other implements designed to discharge missiles in the air or under the water which are capable of destroying animal life is prohibited. The possession of such objects or implements is prohibited unless they are unloaded and adequately cased, or broken down or otherwise packed in such a way as to prevent their use while in the park areas.
What does that last part mean? I interpret that to mean you can have an unloaded locked weapon in your car without penalty.