I'm including photos of the supplies I use, as well as a video.
All of this hinges on owning a van, or other vehicle, with a hatch back. There are ways it could be adapted for other vehicles, too, but those are not included in this tutorial.
To be quick, I set up a table in the back of my van, then put a curtain around the trunk to maintain privacy.
This is the table I use. It has legs with adjustable height and folds in half for easy storage. I found it at both local warehouse stores for around $38.
Here it is with the table set up, and a portion of the privacy curtain in place.
This is what it looks like from the outside when fully set up.
Here is the video, showing it all coming together:
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