Sedan Rear Axle Weight Rating?

[Redneck in training]

Will you please post a picture of the underside of that trailer when you get a minute? I was thinking of mounting mine with trailing arms like you said, but I hadn't thought of the torsion bars. I was having a heck of a time trying to fit springs or struts into my design. Anything I came up with raised the ground clearance above what is acceptable to me.

I will take few pics and post them when I get home sometimes this week.
The torsion bars work very well but you need shocks due to low inherent friction. Leaf springs have much higher friction so they act like shock absorbers. If you install some stops (in my case hydraulic shocks that bottom on overload) the trailer can carry way greater load than the capacity of the axle would suggest. The highest load the trailer ever carried was a load of river rock. My guess is weighted about 2500 - 3000 lb. It pushed my car into an intersection with locked breaks while stopping from about 25 mph. Only limitation (besides of capacity) of passenger car axles is the width. Since the axle has hydraulic breaks installed it shouldn't be a probelm to utilize them.
I think Renault, 2WD Audis and VW have torssion axles on the back.

 

[Redneck in training]

Will you please post a picture of the underside of that trailer when you get a minute? I was thinking of mounting mine with trailing arms like you said, but I hadn't thought of the torsion bars. I was having a heck of a time trying to fit springs or struts into my design. Anything I came up with raised the ground clearance above what is acceptable to me.

Here they are.

 

[Iplayfarmer]

Here they are.

Thanks!!

That helps. I'm considering something similar, but using a coil over shock where you have that shock absorber. Looking at your pictures I realized that I don't have to have the shock completely vertical. That's simplifies the plan.