Yup, see my sig. Towed with this combo for roughly 10,000 miles including over Colorado peaks, Idaho, Montana, most of the Midwest, New England, PA, NY (Adirondacks), usually cruise between 60-65MPH and get 12-15mpg doing it.
WDH not likely needed with that small of a trailer, but if you find that it porpoises or bottoms out over certain bumps on the freeway then a lighweight WDH will help improve the ride quality and prevent that from happening.
Just got back from ~3,500-mile road trip (not towing), from IL to AZ and back with some driving/sight-seeing while in AZ, and averaged 26-27mpg for the trip with the bed full of "stuff" (Suitcases, backpacks, gifts, tools, etc). Gotta love it!