No - it's not perfectly level as RAM specs a rake (front down/rear up) with about a 1" - 1.5" difference - rear will be higher. This is to help with aerodynamics and fuel economy, as well as to counter high speed lift on the front end, I'm sure...not that THAT should be any kind of issue with bricks like these.
No - aftermarket leveling kits will not work - the air suspension is not like a normal spring/shock/strut suspension - the air bags are the springs. There are, to my knowledge, no kits that work with the air suspension on the market. I'd expect any kind of changes you'd like to make would need to be custom for the near future.
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