If you aren't Junkers, its a bit tough to imagine Junkers welcoming you to take over smuggling for them. You would be competition. The only way Junkers would receive you would be if you paid them off with a huge chunk of your profits and took all the risks.
Junkers already smuggle. Having others come to their bases to "take over smuggling" is really off. Junkers trust one another as family and help one another as culture and established tradition--you are an outsider moving in and co-opting one of their most profitable areas.
Need to explain that.
I like the idea of a Smuggler's Guild but that's what the Junkers see themselves as already having for themselves. Using Junker bases for your effort--and their ships would be about as welcome as the Hogosha moving in.