I had mine custom made to include a class 1 receiver instead of just the ball head, so I could use my bike rack.
The bend is to keep the load as close to the drive tire as possible. They told me if it was straight back it would push and be difficult to ride with the load away from the pusher.
1) Put the bike in gear and place a block of wood under a tire to prevent it from rolling. You could also use the parking brake.
2) Line the hitch up with the sidecar frame rail. I found it easier to support the end with a jack stand.
The flat plate on the hitch rests against the rear like this. It prevent the hitch from sliding back.
3) Use the 19mm wrench to tighten the nuts onto the U-bolts. I found it easiest to lay under the sidecar.
Here is the bike rack installed:
With a bike:
It sticks out a bit further than I would like, but seems relatively stable. I am seriously considering modifying my bike rack to bring it closer to the hitch. The vertical part of the rack is about 18 inches from the back of the Ural.
A ball mount:
The hitch has a tongue weight of 200lbs which is much less than my bike rack and bike. I also had to stiffen up the suspension when loaded up.
The Ural comes ready to tow too! The trailer wiring adapter is under the rear seat. It’s a square 6-pole connector. Towing could affect your warranty, so double check before hand.