The 2005-2015 Toyota Tacoma bed rack is built from 1.75 x .120 wall HREW. The standard rack has attachment points to the bed rails with T-slot nuts. You can upgrade to the bed bolt mount for $150.00 which has attachment points at the bed bolts made for heavy loads. The rails sit on the top, to give a nice even look. We can add custom options to the rack as well, please email us for a quote.