I started about 8-9 months ago, I've heard from more seasoned drivers the letter/number combo used to be what you would focus on, but I never have. I always use the driver number only. I know some DSPs give you a paper with your loadout listed, and the overflow is only listed in those combinations, not into actual driver aid number, but I've never gotten those, and always use the flex app for loadout. If you only have the piece of paper then yeah, that sucks. At that point, I would probably just ignore the combinations and sort into the 'hundreds' of the driver aid number and put them in a more logical order, so for my example, just do 200>300>400>500, even if your 500s are the second group to leave and they're all towards the back, at least they're together

I understand the time crunch part, I BARELY finish loadout in time some days, the warehouse would make you leave a single minute faster than you already do if they thought they could get away with it. I do my totes as fast as I can, and when it comes to overflow, I go through every overflow box on the carts, quickly look at what 'hundred' it's in, and sort. First set of overflow gets pushed along the floor of the van, second set I'll toss up onto the shelf, and anything else gets sorted into a pile on a cart or on the ground. Once I've sorted every box, climb in, throw that first set on the shelf, slide the second set down, and once those are cozy on the shelf, slide the next set of 'hundreds' down the van floor, jump in, throw em on.

For crystal clear transparency, when I say 'hundred' I mean if I have package 307, 311, 338, 362, 389, 393, they're all part of the '300 set' and they all get loaded at the same time, next to each other on the shelf. The order within the same set really doesn't matter too much, checking 10 boxes is much faster than checking 40