This field is also not readily on the books, mostly because anyone in this profession simply refuses to pay the dues thus getting entered into such books. The independent haulers dodge the Mining Guild and risk life & limb to ferry their loads to the trading centers in need of their cargo. Smuggling, forgery, blockade running, cons...these are the trades you'll need to master if you wish to make a go of it in this field. If you can manage it, then you stand to make a better profit with your unregulated & untaxed loads. One thing is for sure, you need to be faster and more maneuverable than the Mining Guild and local militia vessels that are hot on your tail. You'll need excessive modifications to your ship and you'd better have it in top working order, because the eager recipients are waiting with cash in hand for what you're carrying.
Naturally this field can also be explored by those few wildcats that own a mining operation wishing to operate outside the jurisdiction of the Mining Guild. The same rules apply, you really need to know the ins-&-outs of avoiding the GUild representatives.