I know the competition is over, but I wanted to do this one for myself, to see if the idea I had could be improved.
All the design requirements of the competition, and all of mine (See V4 List) with one exception:
The legs are no universal. They can be used in 1 or 2 axle configurations, but they are not interchangeable front to rear. Everything else was designed mirrored, to be used ion either side of the trailer.
V4 improvements include:
1-Both Springs are tucked into the mount, lined parallel and side by side.
2-Both dampers have been moved to symmetric mounting points that are very close to the body, which will provide substantially better support for the shocks.
3-The Damper bolt locations have been moved and now provide all the depth needed for more support.
4-The trailing arm is longer than the front arm, providing more torque to the rear, reducing vibration caused by both wheels trying to track with equal torque on the mount.
5-Less material was removed, and the arms were deepened a bit. Stress analysis on V4 resulted in safety factors of 3-6, and 2+ on most MES tests. This unit should prove even better.
I hope you all like. Now I can move on to something more productive.... like sleep.