Good design!! This device would also come in handy on sketchy forest roads, especially when the roads have just re-opened after winter. There are often dead trees leaning over the roadway -- rather than cutting the whole tree, cut just the branches that are in the way.
I have never had to do that yet -- I have been able to drive slowly past the branches and let them slide along the top of my truck, creating some nice pinstripes in the process. I wonder if the rules about not cutting in a campground would apply to branches obstructing a logging road in a national forest?