Quote:
Originally Posted by j-c-c
We knew there was going to be an aero drag penalty when towing, even though the entire center was wide open, it was considerable. Weighing a little over 5K, it towed like an anchor behind a diesel PU. Behind a box straight truck, it was acceptable.
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Sounds like the box straight truck generated some vacuum which would render it easier to pull such an unaerodynamic trailer, as if it was catching the vacuum of another vehicle.