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I have seen some tippers driving round with the tailgate unfastened to allow it swing in the wind. All our trailers are tall enough for me to leave my air deflector in the fully raised position. If I pull a very tall trailer (most recent was 15' 5".) the fuel consumption drops drastically. Even with a light load and an empty return.
I could save a bit more fuel by pulling the trailer closer to the rear of the unit but, unfortunately, then some trailers would foul on the rear of the chassis. When YK54 BVJ was new, the fifth wheel was further forwards but rear lights kept getting hit by the trailer legs. The fifth wheel was moved back, one hole (it's a fixed one. Not a sliding one.), and that problem was cured. It's possible that, by now, the cost of rear light fittings would be similar to the cost of the extra diesel I might now be using.
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