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It seems that the reality is that most RV hauler are not having any unusual problems in general. After doing some research, it appears that the following are true: 7.3 is an overall good low tech engine that has virtually no emissions. The 6.0 is a very high tech engine that has problems due to being so complex to meet emissions. The 6.4 has horrible fuel economy. The 6.7 has great power and a better reliability record. Buying a new, or almost new truck is not an option for me. I am starting to lean towards the Cummins now.
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