Might I suggest a small trailer instead? One with cargo box capacity has negligible drag - I used to pull one behind an 850 cc bike on long camping trips, and it was barely noticible. Other advantages:
1) It's not producing any extra aero drag, and might even help a van's aerodynamics.
2) It takes most of the weight off the van's suspension, so better/safer ride & handling.
3) It's a lot easier to load & unload :-)
4) If you want to make side trips, you can leave it behind.
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