That's not necessarily true about working preload. I was seasonal three years ago and had to requalify as a 22.4 after peak. Never even had a training route. Year later I was an rpcd with my own route. It can happen.Not only are they going to hate you, unless you toss their salad daily, but they literally cannot hire you off the street six to one. Since you are not a teamster, you will have to work preload for years, and bid on a driving job, after you join the union.
THEY LIE TO SEASONALS ABOUT THIS ALL THE TIME.