There are several great Warehouse Management System (WMS) and freight management Add-Ons available for Business One from high quality solution vendors. Here's a few considerations that may help narrow down the field:
Independent from the points above, I've found that it is often best to keep the number of Add-Ons installed on a system to a minimum. This greatly simplifies support, upgrades, maintenance, etc.
So I've given you more questions than specific recommendations!
ProcessWeaver has a pretty slick solution.
For Freight management we are implementing IFS Smartfreight which originates from Australia. (was taken over recently by a large corp)
regards Sotos Soteriou (UK)