I like this price point much better. I should start looking for a used trailer and change out the axle. That timbren set looks really nice but the ural is heavy on the bike side and light on the sidecar side so no way to evenly load it. That is unless I put a tool box on the side car side.
Those little utility trailers come up on craigslist all of the time. Should be able to find one a bit under $1000. Those AT's are nice and all....but man, that is half the cost of another Ural!
Have some riding buds that have the Torsion Axle on theirs, fairly happy with it. You may not even have to change the axle...get one, use it and see how it goes. I find just driving a bit slower when in the dirt helps a bunch.
I would put the tool box on the sidecar side, help balance it out. I used to carry my bike on the one side instead of the center...mainly a lazy way so I don't have to jockey it from the center chock when we would load up a buddy's bike if we were car pulling. he live 30 minutes away...over a couple years of doing that. Noticed the one tire wore out a bit faster. Trailer didn't pull all that much different...though that bike is only 250lbs. What do those Urals weigh, about 700 lbs or so?
Found this for you:
http://www.sovietsteeds.com/forums/viewtopic.php?t=40702
Looks almost exactly like the trailer I have.
Bi-Fold ramps are nice too, so it isn't such a parachute back there.