Had the beast at 80-85 mph for the first time today - and noticed a slight vibration/shimmy feel in the steering wheel. Is this normal?

i got that too. im not worried though

Just go faster and it goes away.

If it does go away when you go faster there is a tire out of ballance. Not a big problem but needs taken care of.

I get a heavy vibration at idle for some reason, nothing while driving.

I get this giant SMILE on my face @ around 160 MPH and it won't go away.The dealer told me that is an inherant trait of the Jeep and there is nothing they can do.:D