As far as the 4wd system, nothing. They are the same. The L package includes the tech and safety package I think. So adaptive cruise, leather seats, etc.
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Unless they have changed since last September, the L package does not include the Tech and Safety. The L package was $4000 last September, and it included all the other option packages that in MY2016 added up to roughly $4800. It was advertised somewhere that it was a 20% savings. I wanted everything but the cold weather package, but I got it due to the L package. I basically got it for free.
In terms of Trailhawk offroad equipment, there is no difference between L and non-L. Due to some reallllly crappy authoring/coding on the Jeep website early in the 2017 model year, when comparing models it appeared that a lot of the Trailhawk offroad features were stripped.
'87 Comanche 4.0L Command Trac
'93 Grand Cherokee Laredo 4.0L 2WD
'04 Grand Cherokee Laredo Freedom Edition 4.7L HO 2WD
'17 Trailhawk Light Brownstone 3.2L, L Plus, Tow, SafetyTec and Tech Groups