Aluminum ladder rack for cargo trailer

This is the description from the web site, I bought this and never installed it. The trailer was sold before I had a chance to use it. I paid $275 for it, today it sells for $329, first $150 buys it. I have everything including the instructions to install. For more I formation look at the RA-28 on the etrailer web site. From the web site: “Fitz-All ladder racks do exactly that, they fit most trailer brands 4' to 8-1/2' wide with the telescoping design. Quick, easy assembly in about 5 minutes. Features: Rack'Em Fitz-All ladder rack fits most trailer brands 4' to 8-1/2' wide Heavy-duty extruded aluminum construction Assembles easily in about 5 minutes Stainless steel plated mounting hardware included 4 Mounting screw holes per mounting tab Ladder rack kit includes 4 uprights and 2 crossbars Specs: Carrying capacity: 400 lbs Upright support height: Overall: 22" Bottom of bracket to top of crossbar: 17" Bottom of bracket to lowest point of gusset: 11-1/2" Top of bracket to top of crossbar: 15" Mounting tab dimensions: 8-1/4" long x 1-5/8" tall”