Don't fear the Sprinter vans, or an upfitted Sprinter based class C motorhome. Most are decent motorhomes overall, with their idiosyncracies and options and problems, and there are now so many more upfitters selecting Sprinter cab chassis first as their base platform of choice, because they are robust for a light truck/van chassis and power train. Max torque between 1400 and 2200 RPM, and max HP in the 3800RPM range. With a Ford V10, it's 4000RPMs plus, to get the maximum performance, with minimum fuel economy, which is one of the reasons we traded in our 2016 Sunstar 26HE V10 after one trip, for the 2018 Navion 3.0L turbo-diesel. Quieter, cool running, and efficient.
Even Ford has tried to emulate the Sprinter with their Transit cab chassis and vans. They did a good job at first with the look of the Transit, but it was underpowered and designed for lighter use, and it took a while for most upfitters to choose it over the Sprinter, after Ford beefed it up a little.
The myth about the scarcity of service for Sprinters is just as applicable to Ford based class C motorhomes. Do a search on "can't find Ford shops that will work on my motorhome" and you might be surprised, as there are just as many stories about that.
I have a MB dealer 60 miles away from me, they sell them, and have serviced mine, without so much as a whimper, for 4 years. Their customer service is excellent, as you might imagine. They know how to cater to top end buyers and customers having done so for decades.
Finding service out in the real world can be just as challenging for any make/model of motorhome, Sprinter based, or not. Plenty of anecdotal stories on the various forums to support that.
It's usually just the luck of the draw, just like with fivers and HD trucks, when it breaks, you deal with it as best you can. What else can you or anyone else do?
Good luck with your search.
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Mike. Comments are anecdotal or personal opinions, and worth what you paid for them.
2018 (2017 Sprinter Cab Chassis) Navion24V + 2016 Wrangler JKU (sold @ ????)
2016 Sunstar 26HE, V10, 3V, 6 Speed (sold @ 4600 miles)
2002 Roadtrek C190P (sold @ 315,000kms)