One of my really good friends works on a rehab floor in my hospital and believe me they do more than just bowel and bladder management. Yea they do that stuff because they have a lot of quads and paras, but they also do central line draws, IV antibiotics, trach care, sometimes vents on the stable quads. They deal with ALOT of head injury cases that are relatively stable. Once in a while they'll get a patient that has been rushed through the system to their unit and that patient needs alot of care. They've had MI's there and in the last year 3 codes two of which she helped out on.
Don't worry about your placement, keep your eyes and ears open, read charts and ask questions. You get out of it what you put in it.