A boat tail isn't very practical on a van when you consider the way the rear doors open, and it would have to be removed every time you want to hitch the trailer. Boat tailing the trailer is an option, but you have to consider that a van plus trailer is already pretty long.
Filling the gap between vehicle and trailer again isn't practical because the doors again need to be accessible.
I plan on doing a small Kamm roof spoiler and shallow box cavity at the rear of both van and trailer. The rear of my van is all plastic trim pieces so if I can find some spares at a wrecker it's just a case of plastic welding some ABS to them.
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