So I had to get some more angle iron last week. I welded that last rail on the back half of the trailer. I then welded on some knee bracing under the rails. I ground and wire wheeled the loose paint and rust from the back of the trailer, then I prepped the bare metal with phosphoric acid. That step will convert any existing rust from iron oxide into iron phosphate so that the metal will not continue to rust. Then next step is to paint the frame in the back half of the trailer. At this point, this is basically a one man operation, so it's kinda slow going. I've had some weather setbacks with rain too, but I must push forward. I will post more pics and vids below.