The best advice I can give about loading package cars is to try and look at things from the driver's perspective with your load. If it's an early stop (1000,2000 shelf; RDR, RDL, RDC, Next Day Air, Early AM, etc.), make sure that the driver can get to it. Also, if you have to put something on the floor do to size, put everything else for that stop with that package (or packages) if possible, it helps the driver alot if all the stuff for one stop is together, instead of some on the floor and some on the shelf. Also, use that shelf space! All too often I see newbies who try to load everything on the edge of the shelf (like you are usually told in training), but it will all never fit like that. It is ok to put boxes/bags behind other ones, provided it makes sense to do so. For now, follow the PAL labels and the PAS system, if you do it correctly they can't really get on your case. However, if you do get assigned to specific trucks, learn what you can about the route from the driver. Specifically, try to learn in what order he/she delivers his/her earliest and/or bulk stops, especially the rear door stuff. It's important to know what he/she offloads first from the rear, so that you can have that at the very back of the truck for quick access. Also, sometimes (in my experience...often) the driver delivers stuff somewhat out of PAL order, or they want a certain stop (or stops) in a different spot than what the PAL label says. If you can, try and learn what any of this stuff is and where to load it. Trust me, it will make your job and his/hers alot easier. Good luck, and stay hydrated.