Clay, I've sen lots of those trailers up in the UP of Michigan - where they're used to haul snowmobiles (and other stuff, too). I assume the front is to keep the worst of the slush and snow off the sleds on the trailers - without adding the cost of walls and a roof to a trailer. They'll deflect road crud and maybe do a bit of aero improvement, but the main thing, as far as I know, is to keep the cargo on the trailer a little bit cleaner. Is that what you were asking?