From what I gathered, there are two types of 4th year rotations depending on where you go to school
Students in schools with in house residency programs and teaching hospitals such as MSUCOM, Rowan, NSUCOM, OSUCOM, OHUCOM tend to finish 4th year at their own teaching hospitals, but may leave 1 or 2 months for audition rotations else where. This is depended on the specialty you are interested in. Some specialty will require away but some won't.
students in schools with no in house residency programs such as KCUCOM, LECOM, COMP, RVUCOM end to finish 4th year anywhere in the US, usually scheduled through VASA. When I was interviewing at KCU, students seem to know where they want to do residency so they would schedule most of their 4th year in that particular state or hospital.
When you are scheduling away rotation, do you pick the best ranked out there or pick the one you wish to do residency? Do you consider 4th you to be directed more towards auditioning for residency or gaining better clinical educations at a good academic hospital? Thanks!