Low mileage gasser or high mileage diesel

I think if I FT'd I would go DP. I think FTing you would put on many more miles and the diesel engine would last longer. Out 3 to 5 months a year and no plans to FT a gasser works for me. MPG would not even be a factor. FTing factors that I would consider. How much luggage can I carry gas Vs DP. (my gasser I'm maxed out for 4 months on the road) Longevity of engine gas Vs DP. Floor plan would be a huge factor. (I would need a hobby room) Ease of working on the engine. DP with side radiator would be a must have. Bottom line I wouldn't limit my shopping choices for gasser or diesel no matter how I RV'd. You might find a great buy in either one. However, MPG shouldn't even be an issue.