Tough bird indeed. Big, too, about 2/3 the size of a DC-3. Otters had basically the same engine as a T-6. T-6 usually was a P&W R-1340-AN1, while Otters had P&W R1340-S1H1G or S3H1-G. Different gearing, because Otters flew even slower than T-6s.
Twin otters, of course, had PT-6 engines, twice as many of them, and hardly seemed to be the same bird at all.
As I recall, the Otters at Airpark had been flown in to spend the night on the way somewhere, weren't well tied down, and all were damaged in a violent storm that night. Some were upside down next morning. I don't think any of them ever flew again.
Incidentally, Airpark's runway is 3080 feet.