The most low tech way I have done it is to buy a painters drop cloth and cut it in half or thirds depending on the size. I sewed it to geter to make a really long canvis. Then sewed the end to make a big tube after I painted it. Get two two inch dowel rods and screw them to a platform and stretch the canvas over them. Then just attach som handels on the bottom so you can move it around. Usually only take two people. It will rotate 360 degrees so the car appears to move on an endless loop. then just some midground cars or trees as others suggest to break it up. Its much easier than it sounds.