Run, don't walk away from a Promaster diesel. As was said above, the engine is an orphan in North America, and the transmission is troublesome and VERY expensive to repair if needed. While nothing is wrong with the engine itself, It's a 500k mile engine easily, the stuff on the outside emissions wise is a mess.
Winnebago made a few Travatos with this engine back in 2015/16, they are very rare and a novelty more than anything.
Supposedly FCA only manufactured somewhere in the neighborhood of 2500 Promaster diesels over its 2.5 year, 2014, '15 and part of '16 run
Bob & Sharon
2019 Winnebago Travato K (2018 Chassis)
Past RV's: 2013 WGO ERA 70A, Chevy PW Lexor
Itasca Navion, 29' Jayco 5th Wheel