Mega garage
When you get a property with a garage and you fill it with cars or bikes until it says no more cars can be stored in this garage but you see room for it to simply pull your car (or bike) up to the door (touching it) and get out and wait for the garage to open then jump back in the car and drive in quickly before the door can close and it will be saved
Personally I have only done it with bikes but it should work the same.
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