I finally got around to making the side skirts out of a vinyl gutter, it took less than an hour to do (minus paint drying time), 1 vinyl gutter, 1 can of spray paint and 12 screws. I'm still testing and it looks very promising, more stable in wind and mileage seems to improve but the weather hasn't cooperated lately (colder). I'm still getting better mileage in cold weather than I did before installation
but I'm not done testing. Chumly