'Idol' Judge's Trailers Mansions on Wheels

3/12/2011 8:30 AM PST
It's a wonder the "American Idol" judges ever make it to the stage -- because TMZ has learned they each have a RIDICULOUS trailer ... loaded with everything from plasma TVs to gourmet kitchens.

0311_american_idol_trailer_launch_v3Jennifer Lopez, Steven Tyler ... and yes, even Randy Jackson get to chill out in these pimped out trailers -- featuring massage chairs, surround sound systems, A/C, and even private offices ... UPSTAIRS.

You gotta see these things.