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Template is optimal shape, but it is for best length of 'wing', there are longer wings with different aspect ratio, different kind of aerofoils, maybe longer vehicle would require template to be adapted for such?
My roof is one big level plane, so highest point is almost everywhere, but then again having really good pic from side is something difficult, if car is not photographed directly from the side and from appropriate height there will be big errors, also blueprints are something one really can't trust, those can be way off, but can of course give some idea from shape. There is many things to consider.
Chopping rear end of wagon would make quite nice mini kamm though :P
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