Genuine question - they're presented as these dangerous crime lords and they control a vast region of Space. Yet appear to have no great ability to impose their power. Aside from their inability to pose a direct threat to anyone who can walk out of LOS out of one (including, given how long it probably takes one to turn around, behind it), I don't see any support infrastructure, back-up, anything much really, that would lead the Hutts to rise to the top of a criminal empire.
All I've ever seen of the Hutts are a handful of high-level crime lords (plus Ziro's mother in one episode of TCW). Are there Hutt thugs, Hutt pilots? Engineers?
I get that Joe Average walking into Jabba's palace is going to be met with some scary lackeys who can beat him up or kill him and will do so. But how is it the Hutts get there over all the other aspiring criminals or can hold off military forces to retain "Hutt space". In short, what enables bloated slugs with stubby arms to rule over others? I don't get it. It seems unfeasible. When it was just Jabba in the movie - okay, there could be any backstory there. But now I'm reading through EotE, it seems the entire species has some edge but I don't see what.