block and brace:

You will need:
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8 chocks / wedges
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40 - 50 linear feet of 2x4. Scrap lumber can be used.
Cut 2x4s into 16 x 18" pieces and 8 x 24" pieces.
Nail 2x4s together, making 8 x 18" braces and 4 x 24" braces.
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Put car in gear or park.
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Set parking / emergency brake.
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Insert chock / wedge under each end of each tire. Tap chocks with hammer until snugly under tires.
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Place one 18" brace at the back of each chock. Nail or screw to the container floor.
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Place one 24" brace snugly against the outside of each tire. Nail or screw to container floor.