Truck caught on fire while driving down I75 interstate in Florida. No component or system failure lights where present. Smoke was smelled by the passengers and within seconds the truck was on fire. The safety of the passengers was at FULL risk, and lucky to be alive! The truck was full engaged as soon as the truck pulled over on the side of the interstate. Investigation by GM & Insurance company took place. The truck is available for further investigation. We are unsure how the fire started. It did come up from both sides of the cab, and very quickly. Nothing has been confirmed by any inspections completed by GM & Progressive. GM & the Service Dealer are not engaging as they should be.