Yes,box seats.
Yes
The general seating has no overhead protection. There are suites available. Not sure what's required to book one and they are probably expensive, but may serve your needs. Give the speedway a call.
If your talking about the tour they can accommodate you
Yes, the speedway is handicap accessible. Not sure about the shade part except for the suites. The Speedway faces the east, so for the Daytona 500 in February, the race starts at 3pm so the entire grandstands are in the shade by 4-4:30. The August race is at night, starts at 7:30, so everything is shaded.
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