Go watch this video on Liveleak.com: Failed plane landing
The pilot might have been too cautious on the approach, but then again, what are you supposed to do when a bunch of Ignoramus parked their service vehicles on the side of the airfield, literally stuck to it. What were they expecting an ultra-light?
Individuals on the side of the airfield would not have made the pilot nervous on the approach; he knows the DC-6 wing clears them. However, the vehicles are higher than people are, and the pilot probably never had to deal with parked vehicles so close before. Thus, he tried to remain slightly to the right to avoid them, and then touch ground a few meters past them. Unfortunately, on the right of the airfield, terrain and bushes are slightly higher; it caused the right wheels of the aircraft to touch hard enough to shear it.
I took a screenshot from the video showing the moment the DC-6 (N451CE), touched the mound breaking the wheels (blue arrow). Higher elevation is marked in red. We can even observe the aircraft yaw compared to the airfield shown in blue hue.
Those Ignoramuses parked and waiting near the airfield should have a nice hefty and life whipping fine for endangering themselves and others gravely.