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Tension struts have much more wear as it basically controls the front to back stabilization of your wheel. The trailing arm doesn't have a much wear as it does not see as much force as the tension strut. Imo unless its noticeably cracked or leaking, its probably fine.
When a shop replaces any of these suspension components that contain a rubber bushing, they need to torque the bolts down at ride height, this process would added labor if you decided to not do both the tension strut and trailing arm at the same time. Also for any suspension changes you should get an alignment, so doing them separately would be two alignments.
Two paths imo:
-Get the Turner motorsport monoball tension strut and have a indy shop replace it. This removes the rubber bushing and instead uses a metal bearing. This gives the car a much more 'driving on rails' feeling. F10 OEM bushings are softer to cater to the clientele that would be buying these cars new. This gives it more a much more sporty ride. I am installing these on my car this weekend.
-Do both the OEM Tension strut and trailing arm at the BMW dealership. You will probably save about $200 in labor hours and $300 in alignment as opposed to doing them seperate.
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