Alright gamers. I figured out a way on how to store cars in your garage! Now this includes any vehicle!

1. Find a street car that can be stored in your garage.

2. On your menu have the car you want to store ready to be pressed.

3. Go to your garage and when you see the animation where the car is driving into the garage press the spawn car button.

4. now you should have the modded car in your garage.

5. take the car out of the garage and go to los santos customs. (IF USING ARENA WAR CARS YOU CAN SKIP STEPS 5 AND 6)

6. buy insurance and full coverage for da car.

now this have a few downsides.. u cant store BIG and i mean BIG vehicles sadly.. it'll just kill u.
Enjoy