My MIL light is on and I need to do a 100 mile trip at night. Any problems doing this without taking it to the dealership?

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First 4wd was S3 LR....totaled twice.

You may be on your trip already as I write this, so I hope all is well! The MIL light can be caused by any number of things, so it's hard to say whether or not driving another 100 miles is or isn't ok. You can probably feel if the engine is running rough. If you can get your hands on a scanner, you can pull the code and look up what is wrong. AutoZone and most auto parts stores will do this for you for free. If the MIL starts flashing, definitely DON'T drive, or pull over immediately and shut it off, as this means there will be imminent damage.

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2008 Liberty Sport 4x4 Automatic

Jeepin By Al 4" Lift Kit
BFG KO2’s 245/75R16
Full MOPAR skid plates
Rock Lizard Skink Super Sliders
AtTheHelm Front Recovery System & Roof Rack
M116A3 Trailer build thread: viewtopic.php?f=72&t=77997

If the MIL is on there is a problem,just ignoring it can lead to expesive repairs when a cheap fix could have resolved it if fixed ASAP.Kinda why there is a MIL.