Is there a fix that makes haulers pick up low stack items to one big stack?

[Instructor]

currently several small stacks of the same item take more space than they should have had they'd been stacked properly, and to manually fix that you need to pass the items between stockpiles, which is rather not desired.

Is there a simple mod or fix for that?

[SteelRev]

I use the storage rack mod , stack xxl mod, and build single racks.  I make the racks critical and  have a normal stockpile nearby. It's time consuming to set up but functions well.  The multiple stacks are made when two or more haulers hual the same type of item. They can't reserve the same drop off point so you end up with a bunch of little stacks.