Go back to the preload and stay there. If you need a full time job, start looking for one outside of the company.
You cannot accrue any seniority after October 15th until (I believe) January 15th. They will work you like a rented mule over peak and then kick you back to the preload when the volume tanks. This happens to no less than a dozen people in my building every single year.
If you absolutely need the money, then do what you have to do. But you've been warned.
The bennies you will have to pay for.
The hours are weird, from what I've seen from non-union in the feeder dept is no sense of day or night. I've talked to my sup at all kinds of hours day or night. Not sure when the poor guy gets sleep. I may talk to him at 6am then he may text me at 12:00 pm while I'm sleeping, then call me at 3 am.