Hi Matt - welcome to the forum.
MOST of the aero mods you see on this site are cheap.
So I don't think you're going to have any trouble finding examples of those.
The cube van would benefit from wake reduction via simple panels like this:
Quote:
Aerodynamic drag can be significantly reduced with trailer add-ons that reduce the wake and increase the base pressure. - Source: SAE 2000-01-2209
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