It depends on what you use to pull it and what you haul. I Iike my axle further back more like 70/30. Tongue heavy pulls better to me but I have a heavy diesel truck. I also feel you need to consider some 2 x3 or 2 x 4 boxed tubing for your main frame long runs. I had a store bought trailer made similar to what you describe and it was weak, flexed and bounced a lot. I tend to over build things. The last trailer I built was a 10 foot single axle dump trailer. It was rearended by a 18 wheeler. Towed trailer home. 18 wheelers whole front was tore off, suspension damage, had to be towed away. Build it like you dont ever want to work on it again. Put wire in conduit. Good luck.