Ecky,
I use PowerPoint 2010 to do my overlays, put both pictures on one slide and drag the AST-II over the picture of the car. The AST-II will go semitransparent and you can see them overlaid quite nicely. Use the built in scale and rotate tools to make them match up.
Your car is already fairly boat-tailed in the back, making a trailer that continues the boat tail to reduce drag will result in a fairly small trailer.
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