I’m not an expert by any means, but every commercial solar install I’ve seen over public parking lots has included steel beam construction mounted on reinforced concrete footings that extend 2+ feet above ground. The concrete footings appear to be designed not only to support the structure but to be able to absorb the impact of cars that might otherwise dent/bend the steel supports. A few examples:

https://maps.app.goo.gl/fcQ9PUoWp68c21n57

https://maps.app.goo.gl/QqbmVsphByzN5Xi56

https://maps.app.goo.gl/n3wUKkYZLMCpzVTz5

The electrical infrastructure to support these is also significantly more than a residential solar setup. I have 44 panels on my roof, and I counted around 488 on one of these carports. I can generate around 85 kWh on a clear day, so one of these can probably generated 1000 kWh or more. You’ll need good electrical infrastructure to safely manage that and feed it into the grid. I didn’t need any infrastructure changes when my solar panels were installed other than a new utility meter. These all likely required a lot more than that.

Solar had pretty high wind loads that need to be supported