Doesn't a torsion axle mount directly to the frame? Wouldn't that make it awfully low for some campgrounds and stuff? I know my Chevy is going to site pretty low and I am not sure I would be wanting to go over gravel and whatnot, that is why I will be using my GrandAm for a tow vehicle.
If you could make a mounting bracket to give it some extra space it would be great. I had a motorcycle trailer set up like that.
The idea is great, though a little pricey. It looks like a complete axle runs around $800.00 or so.
Here is a good site for those:
http://www.orderdesk2000.com/subwebs/he ... -axles.htm
If you can afford it, I would say go for it. I would just put an extra piece of steel under the fram to move it away a bit and give yuo some better ground clearance.