Once on the visual portion of the approach it is very challenging landing north on 02. Landing long or fast can put you off the 70 ft cliff. The 20 approach is coming into the pass to TGU so is very safe. The 02 approach puts you over terrain that will make an early descent a disaster. All the accidents I have read about happened on the 02 approach descending early.90% of the 20 approaches were a circle to 02 because of the prevailing wind.
The displaced threshold gave you 5400 ft of runway with a downslope of about 1 degree at 3300 ft MSL with a 70 ft cliff at the end. You could only make minor mistakes on this one. Wet runways made it even more challenging. We always had our landing distance charts out landing at TGU. It wasn't that hard to land there when you were comfortable with the procedures but the new guys were spooked by it at first. Some never went back.