Originally Posted by Greg H
I was thinking on the tug.
A clamshell rooftop carrier[like an X-cargo] would be an excellent choice for the top of the tug.
Normally they are an horrible drag without a trailer, but if you get one with a tapered front, it may actually improve the towability of your trailer while providing the extra space needed.
I would fashion two flat crossbars and bolt them to the bottom of the carrier then fasten them securely to your roof rack. The straps tend to allow the clamshell to porpoise more than I like.
[watch the others when going down the road.]
Maybe even fashion a small faring along the front edge of your rack.