I considered aluminum too, but I'm always concerned with maintenance and figured that I wouldn't have to re-polish the stainless in the future. I do know that there are more design options if I consider all of the extruded forms in which aluminum is made. I imagine I'll try to design a bow that I can just drop in place and lift back out. The utiline box does not have any side pockets in the middle to locate a bow so I'll probably use an angle that rests on the bed rails. I may have to pad it to keep it from scratching the paint.