First thought... that's a LOT of steel... but I can't talk, I used a lot of steel in mine to

... but more importantly, your tounge is to short. Mine is 48" and I put an 18" T-box on and it BARELY cleared at tight turns.. yes, a miss is as good as a mile, but still, I would have liked to have had more. The next one will be 5'... check my album for pics of the trailer... deeper into the album you'll see the "frame drawing" I have, like yours. I used 2"x1/8" sq tubing, 2"x1/8" angle and the tounge is 3x3x3/16 Total weight of the frame, wheels, fenders, axles, jacks, etc., etc. was 400#s; 15" aluminum mod wheels and Dexter Torsion axle.