Id add alot more steel to that thing Jordan. My trailer has that size c-channel doubled stacked in front and goes to a single after the rear axle. Also, like Tree Climber said, those c-channels laid flat are much much weaker than when laid on edge. Just take a look at some other trailers, they will all be built on edge. If you had square tube then that would be a different story.
Dont skip on the axles either. My trailer has 3500lb axles and I wish it had larger wheels and tires as I have had many blow outs and have had the brakes smoking when I had my old F150.
I saw two brand new trailer axles strapped to a pallet at the steel scrap yard near the dump, I believe they were 8-lug. Could be a good score.
