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i like wintercamping and do it at least two times a month during the cold period, but damn -20°C is really cold. i had many nights with temps around -10°C but without the right gear and a nice campfire when possible i would have frozen my ass off.
take the warmest gear you have and since you camp near your car pack an extra blanket, thick wool socks, and a good balaclava for sleeping. While sleeping try to have a good insulation between you and the ground, a thin summer-mat will not be enough.
i dont know how experienced you are. if you take the right gear with you it will be manageable with basic skills. But i really recommand you to try it out in your local forest before with milder temps.