If you decide to go down the route of changing the trailing arm instead of welding and you need to change the wheel bearings have a look at this thread

http://www.peachparts.com/shopforum/showthread.php?t=277341

(Sorry I'm a self publicist)

And piece it together with the DIY

http://www.peachparts.com/Wikka/W123RearWheelBearings

The thread shows an easier way of getting the hub in and out. You can even do the job off of the car.

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!