The drag behind snowplow actually works quite well. It technically does not “plow” the snow, but it does compact it sufficiently for the weaker or lower profile car to get in and out easily.
In our case, we attached a sheet of plywood to the tailgate of our minivan, added the weight of two adults standing at the bottom edge of the plywood, and made a slow pass down the drive. It only took about two passes to get a 17 inch snowfall compacted enough that I could get my Dodge Dynasty in and out.