You can't beat a 7.3 late 90s early 2000s or a 6.0 with all the work done to it already (DPF, Turbo, EGR) etc. Or a duramax with an allison trans.. The f250 7.3 lariat would be a luxury workhorse that you couldn't beat.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k