Rob's NV

I am getting this Shaking/Vibration on my NV 2500 Van, 2016. It's dangerous, I'm in here having new front brakes installed again, but I think there is a Steering issue , and or suspension issue, I feel the shaking all the time, especially with weight in the back. I also noticed if the engine is on, and I'm just sitting in a parking lot for a while, when I do start to drive it again, the steering is very tight at first , them eventually it goes back to normal feel. Help Anyone ??