Jeep toad catches fire on interstate 15 in the Cajon pass

The pictures are high quality and you can zoom on them.
Jeep engine bay is pretty badly burned, so my first guess would be that is where the fire started, as outside fire would not go under the hood easy.
Rear of the motorhome is burned, but plastic and fiberglass go very easy.
Look at the angle of tow bar. Might be partly due to flat tires on Jeep, but still way too much.