K, then I'll answer you. You are not a permanent employee. You are a pre-seniority employee candidate. You have to complete your qualification/probation period before you can make seniority. If they claim to be hiring you as a preloader, then that means you'll have to work 30-90 working days (depending on where you are in the country) performing at the level they want you to perform before you make seniority and become a permanent employee. You can't make seniority during the "free period" which is the last couple months of the year. I think you'll find
this thread helpful.
They will likely use you as a preloader, cover driver or both as peak ramps up. Here's the thing...If they're not using you now a week into October, they likely won't need you after the first of the year because mid January to late spring is our slowest time of the year.
To summarize, you could get a call any day to start working, but you won't make seniority and become a permanent employee by the deadline so you could be let go after Christmas for any or no reason...OR they could end up needing you/liking the way you work and making room for you.