I'll tell you what, today was the first time in 6 years (know its not long compared to some of you) that I legit was about to lose my mind today at work. It was just a complete disaster (bulk on the belt that feeds my area jamming it up all day, stuff falling on me at the split etc....for the past 4 days). I split the belt as the person I'm supposed to have split the belt has about 900 pieces to load and one of his cars is on the opposite side of the belt (good idea I know). I run a belt to car area like yours and from what I've seen a 4 car pickoff would be a disaster anywhere but the back of the belt and even then it'd still suck royally. Then again the math doesn't lie, one pick i have is about 1000-1150 daily and the unload is generally down in 3 hrs....thats a 334-383 pph just to keep that pick up....which is NEVER going to happen on a belt, in fact it will create quite a mess on a belt to car pick. I'd say that at least 45 min of our day is picking up stuff at the end because they cram it down our throats at a pace that no one could keep up, but we wrap so no one cares.
On a boxline (many of you probably don't even know what that is, as most areas are belts now) 4 cars is doable, but you still can't follow the methods to a T with 4 cars, 3 yes, 4 no because by the time you load the last car (4th), the cage is already past your first one and you're behind. However at least here, when the flow lightens up the packages are still in the cage for you to grab next time....on a belt you missed them, they're gone until the end unless your neighbor pulls them off for you which they may not have time to do as they're screwed too. However the same math applies there too, no one is going to load 330+ pkgs an hour and they shouldn't have to as I know of no one myself included that could do that day in, day out, no misloads, no stacking, good loads and not get burned out. Not to mention our building isn't designed to process a flow rate like that, yes it can do it, but that doesn't mean it should.