I am unaware of any real durability issues between the 2 trucks running gear, however, the coil spring set up gives a much better ride, gets better traction if you decide to drag race (or just like launching from the stop light) and with the long trailing arms, it'll distribute the weight of a large load a bit better.
I have noticed a tendency for the old leaves to break, but I don't know if that is a real issue, or something I have just come across more often than others.
If you were to look under some of the NASCAR... I think bush car, they have an almost identical set up as our trucks.
The coil set up also corners quite well for a live axle in a pig of a truck.
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