I think that it's a great axle idea, no idea how they work in real life. I've seen them used under towable cement mixers, concrete pumps, and big mobile air compressors.
I would seriously consider adding a shock to the spindle end of each trailing arm. Shoot for a mounting position that has the shock body 90* to trailing arm at full compression.
I like it as well. I do however see one issue. It has no swivel in the middle so for it to absorb a bump both sides will have to compress. If you could figure out a way to put a center bearing so it can operate as independent suspension it would be ideal. Put an arm on the axle and use a horizontal shock for best ground clearance.
That doesn't look like a great idea. No friction like a leaf spring, and no rubber hysterisis like a rubber axle, so it might bounce a lot.
If you could figure out a way to put a center bearing so it can operate as independent suspension it would be ideal.
The axle could be acting like a torsion spring. So you have anti-roll as well as load bearing.