What exactly is the advantage of lip loading? I see discussions saying that a package is less likely to fall off when lip loaded but that seems counter intuitive to me. Wouldn't it be less likely to fall off if it's behind the lip?
I'm assuming this may have already been answered. Nevertheless- lip loading is effective when packages must be stacked on top of other packages (on shelves). The top packages are at a decline towards the sides of the truck and are less likely to fall off the shelves in-transit. This is most effective when there are no gaps between packages when the load is finished. Gaps will allow packages to move side to side, and stuff will fall off anyway.
Lip loading is absolutely ineffective if every package is side-by-side, which may only occur for a training or rural route (unlikely anyway).
Earlier this week I loaded a junk resi route and at the end of the sort, it was so light that I went through (because I had time) and put every package in 100% sequential order, side-by-side, not lip loaded. Shortly after, the dispatch guy came by and cut the route. Such is life at UPS.