Underhood Wiring problems of the 2001 Dodge Ram 3500

While I was driving to work smoke started entering the cab so I began to pull off the highway. I began to notice bright lights from under the dash. Before I could get out flames began to enter into the cab. I only had time to jump out of the truck and watch it engulf into flames. I was able to get out without any harm to myself. The only thing left is the bed of the truck.