2018 Chevrolet Colorado drivetrain & axles problems

I had truck stationary parked on a slight incline on a dirt road for about 5 minutes when I heard a odd sound like "arrrrr clunk" and my car rolled down a hill. I had my car on park while on 4low with the engine off. I did not have my parking brake on though but the incline was so slight I feel I did not need it. My truck was not loaded with any extra weight or anything to cause it to roll down the hill. I truly believe I am not at fault for this happening it is a brand new car how could this happen?

Truck shakes at speeds above 55 MPH. At 65 MPH my phone will fly off the magnet mount on the windshield; water and ice shake as if boiling at 70 MPH and above. Sometimes the vehicle feels like it is coming apart it shakes so hard. When the vehicle was two months old it stopped on a city street in arlington va and was undriveable. After a timeout period of 10-15 minutes it was driveable but at 10 MPH it whined as if the transmission or engine was going to blow up.