Why did this GMC 2500 catch fire?

[draginbyu]

It’s easy for the floormat to get pushed by the  door when you close it and it start revving when it closes. The window isn’t as easy to break out as people think it is. The bigger tool you try and use the more it bounces off. The seals burning out and oil catching fire isn’t that hard to believe. I have had a bike catch fire while doing a burnout it blew an oil line and the red hot exhaust ignited it. Similar to this. Not all trucks and cars sense the key in the ignition and can lock the key in the vehicle pretty easy. My Boston terrier stepped on the button and did mine  I’ve always been nervous about it because I installed car stereo as a job in late 90s so I roll windows down but when selling your truck it’s easy to get excited and do it.