The Batmobiles are shot using a very high-tech item. A piece of white A2 paper. This is lent up against a wall go give a curve, so no corner at the back is evident. This lets me use f22, and the white background just appears to be infinite. I have a small LED light array and a reflector to provide some light sources, but the room is south facing, so I get daylight to do a lot of the work.
And that is it. Next time I do a Batmobile shoot, I'll take some shots of the set up. It is truly primitive to behold.