Many of the truck makers are scrambling to make diesels for their 1500-class trucks now. GM has a 4.5L TD that should be out soon.
We *should* be seeing more diesels on the road shortly.
4.5L? That’s still larger than *should* be necessary for adequate performance in a light-duty pickup. I’ve seen 20-ton straight trucks that were hauled around by an engine no bigger than that.