Click to expand Tap to zoom 72 X 3 X 3" Straight Cross Member, 3/16" Wall, Structural Aluminum by AmeraTrail Parts Save Liquid error (snippets/product-badge line 32): Computation results in '-Infinity'% $162.39 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart 3 X 3 X 72" Straight CM Industry Standard 3 x 3" Crossmember Length: 72" 3/16" Wall Structural Aluminum Solid Aluminum Extrusion Fits Most Boat Trailers 72" Wide AT# 72STCM316