Business reasons aside, why would Jabba the Hutt live on Tatooine? According to the Wookieepedia page, he's a gastropod, and we know that salt kills slugs. Tatooine is a desert with two nearby suns, an environment slugs do not survive in.
Are there any explanations for how he and the other Hutts do not die in that environment?
Like most of the wealthy and corrupt of any species, (not that the two are associated by default) he throws money and/or henchmen at problems to solve them.
Additionally, as pointed out in the comments, he is a Hutt, and not a slug; as his physiology is the alpha predator of his planet's evolutionary testing ground, adaptability is requisite.
The question wouldn't then be much different then "how would humans survive?" To which the response is adapt ourselves, our tools, or our environment.
Even if Wookieepedia is right, they only say that the hutt are Gastropods
In our galaxy, Gastropod only means that he walk on his stomach (and Jabba certainly does it).
Gastropod doesn't mean that he is a slug, a snail, or whatever, nore it means that salt or the lack of water can kill him...
Even in our planet, some gastropod can live with very little water : https://en.wikipedia.org/wiki/Xerocrassa_seetzeni
A lot of them live under the ocean (so they don't fear salt)
So Jabba may be a desert gastropod, or just rich enough to buy water, stay inside, have a shadowed barge, etc...
Acording to the new canon novelisation of Star Wars: Return of the Jedi, Jabba's Palace (a former monastery) is kept cold, dark and moist, precisely the sort of conditions that would be most suitable for a giant slug to prevent them drying out.
Just as a slug prefers to hide under a rock, Jabba has chosen a dark, damp place for his palace. The nicer rooms are like a dungeon and the dungeon is…unspeakable. It’s a fortress, really. So deep in the dunes that the desert itself is all the defense generally needed. Even so, under Jabba’s orders the old monastery was obsessively fortified by master armorers.
Yes, it’s the perfect place for this rancid crime lord to slither away and hide, wallowing in his slimy pleasures and chortling over his ill-gotten treasures.
Star Wars: Return of the Jedi: Beware the Power of the Dark Side!
It seems likely that the Hutts came from a planet far more well suited to their physiology (as did many other species). In the case of the Hutts, it was likely the very fact that Tatooine is so inhospitable that made it desirable to them. The planet is sparsely populated, has an underdeveloped government system, and clearly has no real standing army. As such, it would be like a very underdeveloped nation in an inhospitable part of our planet. Why might a very wealthy family decide to live there? Because in that small pond, they immediately become a very big fish.
Real world example: Certain mafia families decided to set up operations in what was, at the time, the middle of nowhere in a desert backwater called Las Vegas. They invested huge amounts of money into building casinos thanks to the (at the time) unusual legal gambling laws there. Why would they do this? Because the smaller, less developed state made them more influential over the local government than they would be in a very developed place like New York.
I see the Hutts coming to Tatooine very much in that vein. It wasn't because the planet was hospitable to them, but because it was undeveloped and they could easily co-opt the levers of power. It was undeveloped because it was inhospitable, so in a way, they went there BECAUSE it was so harsh for them to live on.
Because Tatooine is the home of prime hunter (Cantina is a good place to hire them) and black market area. Also there is many illegal activities on Tatooine and you know that Hutt clan are linked to.
