Lose Power Steering problems of the 2012 Dodge Ram 1500

While driving at 60 mph the truck failed to downshift for an incline on the highway loosing momentum. I depressed the accelerator pedal to the floor and nothing happened. At this point I signaled to move onto the shoulder while the truck continued to lose momentum. When I turned the steering wheel, it was difficult to move as if I had lost my power steering too. The brakes worked and I stopped on the shoulder. I placed the truck in park and back to drive: nothing happened. I placed the truck in park, turned it off, waited a couple minutes and restarted. The transmission and steering now worked. At no time did any warning light appear on the dash. I could have caused a significant pile up on the freeway during rush hour. Since no warning lights appeared on the dash--how do I know what happened--or more likely, how will the dealership find the root cause for this failure. This behavior is dangerous and unacceptable for a 2 year old truck with less than 15k mikes. I use my truck to sometimes pull a horse trailer. If this incident happens again while I am towing the outcome will be disastrous. I am now scared to drive my truck.