What kind of used truck can I get for snow plowing?

I'm interested in buying a truck intended for plowing snow on residential driveways in the Western NY area. I intend to do 60 driveways for the winter for the initial year. My budget is limited to $20,000. I was looking at some Ford F-250s, but my friend told me all I needed was a Ford F-150 or a Silverado if I went with Chevy. Any suggestions?

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