Actually they did repair and reuse the cars as often as possible. some they couldn't some they could. They used a total of 321 chargers in various ways. The most often repaired and re-used was General Lee #1, which was the first Lee used, jumped multiple times, rolled and wrecked. they rebuilt it multiple times in the first season before lastly using it as the wrecked "Petty Race car" in a later episode.
yes, I think it's at Bristol Raceway.