A support beam and attachment clevis assembly having a pair of “J” beams, each “J” beam having a stem and a tail, each “J” beam's tail having a distal end and a longitudinal extension, each “J” beam's stem having an upper end and a longitudinal extension, the longitudinal extension of each “J” beam's stem being greater than that of said each “J” beam's tail; and incorporating a plurality of blind rivets interconnecting the pair of “J” beams so that the distal end of each “J” beam's tail contacts the upper end of the other “J” beam's stem.