I' m creating a new vegetable garden from part of an existing raseberry and black berry patch. To prevent the trailers from encroaching on the new garden I thought I would create a barrier by burying a section of metal lawn edging, but could not find any wide enough. My idea is to dig a 12" trench line it with old aluminum siding and put aluminum flashing at the bottom. Will that do the trick or is there a better idea?. Or will they find a way around it no matter what?