Reinforced Cross Members 

We use 6" x 6" wide flange @ 15 pounds per foot.
We use and have a patent pending on our reinforced cross beams. Our 6" wide flange cross beams have 1/4" x 5 1/2" x 5 1/2" gusset plates on the outer edge of each side fitting to the web of the joining beam and welded to the flanges and web of the members.