Catsrule is absolutely right. Run, do not walk, away from the job offer. 300 beds--half Medicare--and one MDS nurse??????
I am a unit manager, so half my job is supervisory, the other half is MDS/careplanning for 49 beds, and I never have a dull moment. I used to work in a building where there was one MDS nurse for 180 beds (60 subacute), and she was very, very good, but horribly overworked. I cannot imagine one person doing 300. The other disciplines would have to be completely on top of their sections, and the floor nurses would have to do the nursing sections, and probably you'd need someone else to do the care planning, and then maybe you'd survive--barely.
I'm sure you'll find some other way to get out of home health without going back into the hospital. Pay in LTC, at least where I live, is somewhat less than hospital nursing. There's lots of agency work, though, which pays very, very well.
(And yes indeedy, cats *do* rule....)