The best way in camera would be to soft light the car from several off camera strobes or whatever and expose for the sky using a tripod probably.
The composition is a bit off, but you probably know this, as your other shots are nicely composed. Maybe you were intending on a crop. It looks like you have legged it up to a random car somewhere and just taken it as a snapshot with a phone just held at arms length..
I would say that the photo would def benefit from a lower shoot angle. A better location would be better I would think to. The background, even if exposed correctly, would be somewhat marred by the buildings etc. Not that you couldn't have buildings, just something a little more interesting. The car maybe should fill more of the frame too.
The ground is a bit mundane as well. If you want a rustic looking spot, it needs to be 'more' than it is. I think there are bits of litter in the foreground? Probably would have moved them myself.
It looks like its next to the road, I don't know what it looks like, but if you put the car nearer the road, and used it's lines to compliment the shot? Like going off into the distance or something.
The bottom shot is excellent in comparison, could of been taken by two different people.
You are correct also, as a different approach you could indeed take multiple exposures and stack them in photoshop for a better image.