Was recently offered DEC ATR based position, which I ultimately did not accept. Thought I'd add my experience here to supplement what has been said.
My application was for a fixed-base position, but upon further negotiations it was clear that Empire wanted the option to float me when convenient for them. Although not opposed, I wanted some sort of guarantee that it wouldn't happen often, but they pushed back on any specific language regarding my floating and, if floated, any compensatory time-off. In the course of trying to work this out, I suggested I re-apply for a formal floater position which would clarify how I would be used. The company balked at that since they now knew I lived in base. Ultimately I felt the unknowns were too great, and I pulled my application.
A take-away, at least for me is that they would like the flexibility of floating people, but don't want too many full-time float pilots on the payroll. I understand bases like KTUL are horribly understaffed, but since applying for a PIC at my home would have fully staffed us here, I didn't want to get shipped off repeatedly to another town. Their unwillingness to clarify how you will get used is an impediment to recruitment if my experience is any indication. Frustrating is the word I would use to summarize the entire rodeo. To answer an earlier question regarding transfers, I know it is done on the FedEx side, but don't know how a lateral to Ohana would work.