Trailer mounted wind deflector

[Willcoc]

My Dad has seen some gooseneck trailers that guys have put on wind deflectors on the nose. Trying to research how tall, wide and angle it should to help on fuel usage. Transporting antique tractors so not real high or wide. Any guidance or recommendations?

[Inspector]

It might be different with the deflector mounted on the trailer but the deflector that I had when I had a fifth wheel was mounted on the pickup and all it did was move the bug line higher up on the end cap. I don't know if it helped with economy or not but it did make for a longer reach to clean the bugs off.
Denny