The Stone Guard is home made, the uprights you see are curved sections from an old tramp frame with some threaded rod bent and welded for U bolts, the screen is shade cloth which was laced with bungy cord to stainless loops on on the edge of the van. It's getting an upgrade to V3.2 atm as it chaffed too much on the uprights last trip but as a stone deflector it worked really well, not being kept tight as a drum the stones would drop away not just richochet. Will post a pic when I get the new screen made up.