V8 or V6 Twin Turbo pickup?

Bottom line, if you are going to buy a car or truck to tow your travel trailer, pick something that is safe, reliable, comfortable, has the needed towing capacity, and minimizes its environmental impact, that you can afford.  It's all a matter of personal choice.  The major vehicle manufacturers usually make engines that last a very long time, whether gasoline or diesel, turbo or not.  Certainly there are some notable exceptions usually found when a company experiments with new technology, but that is the price we end up paying in order to see engine technology advance.  Hopefully, in the coming years, we'll see non-CO2 emitting power plants for TV's emerge with adequate range and refueling infrastructure to make cross-country trips possible.  There will always be promoters and detractors of new technology; some touting the new stuff, while others preferring what they believe is tried and true.