You should post a link to download one of the raw files. Otherwise, the judgement of what is overexposed or blown is somewhat subjective and based on your processing, not necessarily the data itself.
In general, the very bright highlight areas are turning gray as a result of trying to recover areas that have no recoverable data - the asphalt, the back of the tractor trailer in the background, etc. This would indicate that those areas are gone in the raw file.
You picked a challenging time of day to shoot anything, let alone a black shiny car. If you must shoot at this time of day, try to find a better location that doesn't have a lot of white or bright objects around to blow out the details in the vehicle via their reflections. You could also find some open shade and locate the vehicle there for some toned-down lighting and manageable dynamic range. You could also use flash/ reflectors and expose the background with shutter speed and the vehicle with aperture/flash power, as well as manage the reflections to emphasize the contours of the vehicle body, etc. As mentioned by others, you could also try some exposure blending or HDR approaches as well.
To judge the exposure via the histogram, consider the UniWB approach to making the histogram on the back of your camera more indicative of the raw channel data.
Kirk