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If you need to use your firearm in a defensive situation, you will more than likely not be able to draw, rack the slide and defend yourself before your attacker is on you. Carrying with one in the chamber, as long as the trigger is covered, is perfectly fine and safe. The striker-fired Glock will sit in your holster forever and not discharge.

As for leaving it in a vehicle, I would make sure it's in a lock box or car safe so it can't be stolen. Other than that , since it has to be concealed, it would not be in direct sunlight, so shouldn't hurt the pistol even if the vehicle is hot. As for it 'going off' because it's hot, it won't. Also, when removing it or re-arming when you come back to the car, make sure the trigger is covered with the holster. A paddle-type holster is easily removed and re-installed while leaving the gun in it.