UPS drivers are making six-figures with seniority, and most of them love the work -- they're outside and get to interact with people frequently. (I've yet to work at a business that isn't on a friendly, first-name basis with their UPS driver.) The preloaders who actually put the packages on the trucks don't have it so great. The shift starts at 2-3 AM, you're working on a conveyor belt in a big warehouse, and you have to load 5 trucks in 6 hours -- while the drivers get 8-10 hours to unload their one truck.

Source: Dad works for UPS, I worked as a preloader.