Unless you have a definite number one place to do your residency, the away rotation for IM applicants is not worth the trouble.
It's a pain to schedule, it's expensive, it forces you to be on your A-game all the time in a foreign land. And....there is a chance that you will be stuck with that one attending or resident that "hates teaching" or "never gives honors" etc etc
Unless you know where you want to go or feel that without an away you will not get an interview, it is not worth your time and effort. I did no away rotations and got every interview I applied for.