mandrel bent frame rails

i saw this company online... www.autoweldchassis.com .. they make mandrel bent 2"x3" frame rails. You give them the specs. The only thing is they are 11 gauge steel or 1/8" . Usually everyone i know for stock floor bodydrops use 1/4" steel. You think the 1/8" mandrel bent rails are strong enough if you are building a new frame?