Service?
I think a major consideration should be availability of service. With my Cummins ISX15 and Freightliner chassis, I can get service just about anywhere big trucks get service. Just took a 6,000 mile road trip, encountered a dripping heater core along the way. Was able to get it serviced at a Loves Truck stop where they did a temporary bypass of the core and I was on my way in less than an hour for $50. No issues or hesitation by the mechanic of it being an RV. I asked him about parts availability and he said Cummins are the easiest by far. The Detroits aren't too bad but are suffering a bit by parts supply issues but are not too difficult to work on. Not sure about the Merc motors, especially if you are considering an older rig.
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2014 Renegade Classic, 45', Freightliner Cascadia 126
Cummins ISX15 with 13 speed Eaton auto shift
2023 Jeep Wrangler Eco-diesel toad
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