Well, for one, it should probably be a cinematic smuggler. You're probably looking for more of a Han Solo type and not some guy who pays desperate young women to be drug mules. And even if he's not a completely reprehensible slimeball, you probably want something more daring and entertaining, rather than perfectly planned and boring.
The easiest way to smuggle stuff (besides paying off the guys who do the inspections) would be to ship contraband inside normal goods that sail through inspections. I always thought if I wanted to run drugs or something else like that, I'd drive an oil tanker truck and have the package of goods secured to the bottom of the tank underneath 10,000 gallons of oil. But that sort of thing isn't very entertaining because the smuggling goes off without a hitch.
For a cinematic smuggler, I'm thinking a dropship captain. I'm thinking commercial jumpships don't ask a lot of questions -- they don't have the manpower to conduct any real customs inspections, and if you've got some forged paperwork that looks semi-official, and your money is good, they let you dock. Communication is slow in the Inner Sphere, so a clever guy could probably get around most sorts of interplanetary police notices or whatever. You take off from Planet A's starport after a quick shoot-out with local police (think the Millenium Falcon leaving Mos Eisley). You outrun some local aerospace fighters and now you're headed towards the Zenith point. Now the planet will probably send an HPG message to nearby worlds, telling them to watch out for you. And maybe they'll beam a conventional radio signal towards the Zenith point, telling anybody there not to pick up a Buccaneer cargo ship with the following registration #123-456. But maybe you've got some equipment to jam that signal. Or you've got forged papers changing your registration number to something else. Or you just slip the captain of the jumpship 10,000 C-bills to look the other way.
That's the kind of exciting stuff that you want in an RPG.