2012 Toyota RAV4 body & structure problems

Driver side rear quarter panel started on fire. This occurred after an approximately 4 mile drive. I believe the fire started on the drive. I parked the vehicle in a parking lot with only one other vehicle. When I was walking into the store I smelled burning plastic but did not relate it to my car burning. I was in the store about 5 minutes. When I walked out I saw the fire. There was no outside influence to the fire and nothing inside the vehicle vehicle. The only thing in that area of the vehicle is wiring.

I was driving westbound on I-70 around mp 129. This is just before glenwood canyon. There was a flashing icy road sign at which time, I signaled my intention to move to the right lane which I did. I slowed down and put my car in 3rd. This was just before a curve to the right where the road and visibility narrow. The right lane was completely iced over as I realized when I got around the curve. In front of me, I saw a pileup, both lanes of traffic were blocked.