I came from the boating world to the RV world in 2014. I spent a year looking at different RVs for ideas, configurations, etc ... Even back then the whole DEF issue was troubling - I saw the amount of equipment involved, the necessity of taking on yet another fluid, and opted for an older coach specifically to avoid having to deal with DEF. Now 6 or 7 years later I am reading one sad story after another - our EPA has shot all RV buyers in the foot with this poorly thought out, overly complex system to gain what? A tiny improvement in emissions? My 2002 Travel Supreme - 400 HP Cummins ISL 8.8 liter gets 10mpg. It burns no oil at 104,000 miles. It has a side radiator, raised rail chassis, and if you wanted to spend the money you could make an older coach just as high end as new ones are. I smelled a rat about DEF systems in 2014 and am forever grateful that I did. I am sorry for all the trouble this system is causing my fellow RVers.
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