Hey Mario I have worked at my local Hub for about nine months now. I work the Pre-Load from currently 5:00AM to 9:00AM. I started at 8:50PerHour, and after about 4 months I moved up to 9.50PerHour. Keep in mind that on Pre-Load I only work 5 days a week, giving me 20 hours per week so although the pay is good, they make sure you don't get too many hours.
As a current college student, this job is perfect for me, I work 4 hours a day, go to school afterward, and then i'm off for the rest of the day, plus i'm off on weekends. UPS Pre-Load can be very tough and rough at times depending on what you are doing.
I always remind myself that i'm only having to do this for a short part of the day. When I first started working, they put me in the unload section which is where they usually put all their entry-level employees to make or break them. This job requires very little mental capacity, and decent amount of endurance and strength. You unload trailers full of boxes and bags onto a conveyor belt. This can be very testing, because in the winter it's very cold, in the summer very hot, those trucks increase temperatures vastly. You also have to worry about boxes falling on you, the Night Shift load these boxes onto the trailers and if they don't stack them right, heavy boxes can injure you if they fall off the top of the stacks.
After about a month, I moved from trailer unload, to belt sort. In my Hub we have three belts, the boxes from the trailers come down the conveyors, and are thus transfered by the sorters to belts 1, 2 or 3. This job is all about the strength and working in unison with the employees next to you because the boxes can get super heavy, and they come in all shapes and sizes. A lot of the times you get loads of tires, strange containers, metal parts, wooden parts, anything you can imagine. Plus you have to balance all the different weights while looking at the label on each parcel object/box to send it to the right belt.
Then I moved to 'De-Bagger' which is does not require too much strength, because you get to utilize roller equipment and a large slide for smaller objects. The amounts of volume that come through my area are incredible, I open hundreds and hundreds of bags that contain smaller packages and have to wrestle with these bags coming down the belt, while at the same time, sending blanks, misorts, not in systems, decaps, and no labels to the workforce around me so they can be scanned and rescanned.
The easier jobs include the truck loaders which handle the driver's trucks and organize their packages for deliveries. And decap workers and scanners, who just have to stand their all day and scan/look up adresses.
The work has been tough, but you certainly get used to it. Not to mention the amazing medical benefits they offer after 90 workdays, really good even for part-timers.
Sorry I can't comment on Drivers, i'm only pre-load. Also I have no idea how the other hubs operate, plus my Hub is for a smaller area, not so much for the big cities that I've heard really huge. Keeping this in mind, the other hubs might have totally different jobs and operate completely different.