I have never heard the expression casual feeder driver.. We feeder drivers who are "on call" usually get about 2 hours notice of a start time. Being on call has it ups and downs. Some days a senior guy will call in and you will be the first available driver to cover his/her shift. On slow days, if no drivers are calling in sick, or there are no over flow loads, or extra loads, you may not be called in. Our contract language here, states that there is no guarantee of 8 hours, if you are a driver who has not gained seniority. So, some drivers who have not gained seniority take a run for the week when the bid list for each week is posted. That way, they know they will get their 8 hours, and know what time they have to work that week. Yeah, it kinda stinks being on call, but you have your foot in the door. I can not speak much more of that as we dont use casual feeders down south. Hopefully a feeder from chi will get online and will be able to help you out more.. Safety is huge at UPS, so be sure to memorize the 10 point commentary and all other safety related methods if you can snatch that job..Good luck..