Does South Park get sued more for using REAL companies on their show?

A lot of shows take real names but change them to avoid lawsuits, like Apple to Mapple, and iPod to MyPod (The Simpsons).

Family Guy changed Burger King to Burger Queen and Whopper to Bopper, and Quagmire even acknowledged the names were changed because they're on TV, breaking the fourth wall.

South Park just uses real names most of the time, Taco Bell, Chipotle, Best Buy, Apple, iPhone, AT&T, Verizon, Panda Express, Nintendo, etc.

South Park even made episodes to make fun of Family Guy, and they've parodied The Simpsons.

Do Trey Parker and Matt Stone (the creators of South Park) get sued a lot for using REAL companies names?

Added (1). They even made TACO BELL a HUGE part of the plot in the videogame, South Park: The Stick of Truth. PewDiePie said he bets they'll get sued for that in his lets play of the game.

They probably have a deal with these companies before hand.
In the end its free advertising for the company so I don't see why they would sue Matt and Trey; its a successful show.

You should watch the documentary: South Park: 6 Days To Air.

Because it describes how they just kinda get away with it, because people think: 'Oh well, it's South Park'. Also the fact they make the episode in 6 Days means you can't really do anything major(like get courtesy exemptions).