umm... I installed ES trailing arm bushings two or three years ago and have been autocrossing, daily driving and having regular allignment checks since with absolutely no ill effects.

If you want to know what kind of effort is involved, do a search in my name (white_n_slow, Sh*tBox ) or Bumnah's name on the topic of bushing install, trailing arm bushings or anything like that. You should have no bushing stress issues (and definitely no tears) with any quality poly bushing unit.