Los Angeles: The music mogul - who left the UK pop star search show to focus on setting up the US version - uses the 1,200 sq ft vehicle, which has two bedrooms and two bathrooms, to tour America for auditions.
According to RadarOnline, it also has a $150,000 mobile medical unit.
The vehicle - which also has a kitchen, green room and a huge cinema screen - costs $9,000 a week to run.Simon is hoping the Fox show will wow viewers when it returns for a second series, after he replaced judges Paula Abdul and Nicole Scherzinger with Britney Spears and Demi Lovato.
Britney recently revealed she is having a "lot of fun" working with Demi, Simon and L.A. Reid and tries to be constructive in her advice for the auditionees.
She said in a new promo clip for the show: "So far everything has been so fun for all of us.
"Everything is like a new experience for me, so it's a lot of fun and the talent has been amazing.
"I feel like my judging style is very subtle. I try to use constructive criticism."
Despite saying she is "subtle", Britney - who has been described as an "incredibly tough" judge - is seen in the video dispensing some harsh words to one contestant.
She tells the hopeful: "I wanna know who let you on stage."
Meanwhile, fellow new judge Demi says she is a "happy" judge who values being honest to the contestants.
She said: "The most fun about being on The X Factor is seeing people that really wow you and knowing that you saw them before they were going to become stars. It really is an exciting feeling.
"I would say that I'm a happy judge. I'm really, really honest. That's the great thing about this panel - we're really honest."
The X Factor will return to Fox on Thursday, September 13.
According to RadarOnline, it also has a $150,000 mobile medical unit.
The vehicle - which also has a kitchen, green room and a huge cinema screen - costs $9,000 a week to run.Simon is hoping the Fox show will wow viewers when it returns for a second series, after he replaced judges Paula Abdul and Nicole Scherzinger with Britney Spears and Demi Lovato.
She said in a new promo clip for the show: "So far everything has been so fun for all of us.
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"I feel like my judging style is very subtle. I try to use constructive criticism."
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She tells the hopeful: "I wanna know who let you on stage."
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She said: "The most fun about being on The X Factor is seeing people that really wow you and knowing that you saw them before they were going to become stars. It really is an exciting feeling.
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The X Factor will return to Fox on Thursday, September 13.
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