If you want an enclosed trailer definitely go V8. I have a 2011 2500HD with the 6L v8 and wish I had a diesel. ~8mpg with my 24' trailer and ~15 without.
It pulls the ~10,000lb trailer just fine but the gas is a killer. One of the guys has a Ford with the turbo 6 and loves it... gets 15-20 mpg towing his open trailer.
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