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This was a custom trailer we built in house for outdoor concert use. The entire Floor folded up and was framed by alum I beams on approx 24" centers, that were very exposed in transit on the highway. 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. We toyed with paneling over all the I beams, but after 52 years when COVID hit, I retired.
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