Aero wise that rounded nose left from the horse trailer is about as good a start as you can get. You could build sides up to template. I'm not sure of the trip purpose or how much weight goes on that trailer. Seems like a lot of tongue weight. If one set of axles would suffice maybe remove the rear one for the trip. That would bring tongue weigh down. With a template shaped profile there would be more cargo space up front so the hitch might not be overloaded. Hard to say really. I feel like I'm missing a lot of context...
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