The biggest considerations about whether you can or should leave groceries in the car should include:
Eggs, fresh produce, fresh vegetables should never be left in freezing temps.
Canned goods, glass goods can freeze and explode.
Milk is safe but it also expands during freezing and can crack the plastic jug.
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If your car was as cold as a refrigerator, yes. If not, then it depends how long you left the food in the car and what temperature the meat reached. If you are in doubt about the safety of the meat, do not use it.
Groceries can be left in the car for a while as long as there is nothing refrigerated or frozen. These items should not stay out of cool places for long.
I wouldn't call it a recommended practice, especially in the case of perishable goods.