[Qingdao]

A trailing arm has no effect on the distance from the inside rim of the wheel/tire assembly to the strut.

A twitchy feeling or unstableness could be caused by a bad wheel bearing, bent wheel or just flat out terrible alignment.

Terrible alignment could stem from a bad wheel bearing (most shops don't shake down the rear wheels when doing an alignment; I don't unless I feel something off during the test drive). OR you could have a bent spindle.