Simply group products that have to be loaded together and put them in the right order.
Loading according to delivery/unloading sequence
Use the delivery route and make sure the correct load is up front when unloading.
Priority based loading
Make sure the things that are needed first are also accessible first. Think of a machine installation.
Use warehouse location in combination with the StackAssist sequence to determine the best loading sequence.
Especially helpful when you work according to the Pick to Box principle.