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I assume by scaffold you mean Mason scaffold with five-by-five frames or similar. I would suggest streamlining the trailer independently from the car if you are not willing to make any modifications to the car. Hard to tell in the picture, I'm imagining you're laying the frames down flat.The length of the tongue being what it is, I'm not imagining close coupling of the vehicle and trailer is really an option. I am also guessing that trailer is wider than the car by a decent amount. I'm not sure how many highway miles you put on this combination to make aero mods really worth it, But I would consider a lid hinged off of the tongueWith a frame that coveredThe entire trailer including fenders in a teardrop style shape. If you're just looking to keep the bulk water off the scaffold I don't think you need to go fully enclosed, a simple lid would go a long way.Skin it with cheap 29ga sheet metal from a roofing company, Buy it without the rolled profile. If you need something much better than that, you might be better off trying to find an appropriately sized already enclosed trailer.
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