Remember, the mileage penalty starts at 40%. That's at about 55-63 mph. Unless the operator has run the same route SOLO at the same speed, be wary. The conventional box trailers with leaf sprung suspension tend upwards in penalty points. An aero trailer can trend downwards to 30%. As travel trailers are tall ( this is huge; today's are higher due to slide outs), more info is always worth gathering.
That, and that less than 10% are correctly hitched means numbers fathered anecdotally may (will) he way off.
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