Rear Trailing Arm

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I suspect my rear trailing arm is bent, my rear wheel alignment is out and my tyres ware faster than my front ones. Im considering getting a replacement from a bone yard, and i have the Workshop manual that clearly shows how to do it.

My challenges are my limited tools and without other transport my wife will be stressed

You can look to the above link above where I replaced my trailing arm. Considering you must have had hit something to cause it to go out of alignment. If you go through that thread you can see how the hubs are mounted on the trailing arm. Then you can see how thin washers placed on the hub can bring your alignment back into spec. Consider that option.