I'm a fan of the big block approach. But then I had a big block Impala when I was a kid and want to return to my childhood...
I have a 454/400 turbo combination from a motorhome. The GVW is rated at 13,000 and it was rated to pull quite a trailer. I stare at a computer all day long, and like the idea of avoiding them when I climb in my truck, so the big old gas powered approach has a certain appeal.