it could be that it isn't more trucks catching fire but more people have cameras to share pictures of trucks that have caught fire. Previously you wouldn't see or hear about it unless there was death and TV crew but not now.
Sorry not a good pic,
Weird beast in Hawaii, 2 drive axles, 3 smaller wheels between drive and steer plus another axle raised at the rear.
The raised axle is seen on their cement agitator units.