The OP asked for the differences between the two packages. I got most of what you listed here on my Laramie with the Level 1 equipment group.
Here is a screen capture showing what you get with each package, straight from the ramtrucks.com website. As you can see the differences are the 19 speaker Harman Karmon sound system, heated rear seats, and navigation. It also lists the rear underseat storage in Level 2, but mine has that as well. Maybe they changed things since I bought my truck back in October.
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