>A tall structure designed to put the panels high up in the air and leave a lot of space for cars is a lot more expensive than normal rooftop solar or even fiel

>A tall structure designed to put the panels high up in the air and leave a lot of space for cars is a lot more expensive than normal rooftop solar or even field setups. Since you emphasized height of the structures that need to be built, I have trouble imagining some 10 feet poles and material to support the panels would make a drastic difference versus rooftop installations. What specifically in the details of the installations make significant additions in cost?