The place where I park my car (Escort, now the New Beetle) has the right front tire in soil that I think at some point may have been a flower bed. Like a year ago or more, I bought like 10 hexagonal concrete tiles to put on the ground to keep the car from sinking in when the ground's wet.
So: version 1.0: park in the dirt. Makes a mess when the ground is wet and muddy.
version 2.0: put big tiles on the ground. When the ground is wet, the corners of the tiles sink way into the ground. Still makes a mess.
version 3.0, under development: put a layer of concrete under the tiles to support and stabilize them.
I ended up doing a lot of digging this weekend, and I think that I almost have enough dirt out of there (top of photo). There was some rain this weekend and that made the sub-soil dirt much easier to work with. I set up the tiles in rougly their configuration (bottom of photo) to check the coverage and shape.