Med duty trucks such as a 60 series are more likley to rust through the oil pan than a pick up. I don't know why but always thought by being higher they had more chance of get salt splashed on then. In govt. use a chevy oil pan is good for six to eight years on a salt truck. Even the new cat diesels in the Kodiaks only last five or six years. The first few holes can be welded on the truck with a wire welder then the pan has to be replaced. Never had to replace a pick up pan when traded at ten years.
Been there, Done that, Hope to live long enough to do it again.
Big Bill
I.I.# 4698
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