Interestingly, these 2 vehicle fires occurred in the past week...
In the case of the ute, it wouldn't surprise me if the engine had been modified in an unsafe manner. The revheads that often drive them aren't averse to modifying them at home.
On the subject of modified utes, you sometimes see bush versions with two, maybe 4 very tall antennas and the obligatory bank of spotties. I passed one here in the city yesterday that had no less than TEN such antennas. Even a mobile Ham operator wouldn't need that many!