I have a 2018 PleasureWay on a 2017 MB chassis and don't know if it's the same setup as yours but thought I'd mention that I had a similar situation as you in that even though it was brand new, every now and then it would not start even though the dash lights would come on, the engine would not turn at all. Turns out it was a loose connection at the ground cable connection located right next to the accelerator on the floor.There is a clamp type connector which was not totally set tight. Hasn't been a problem since.