Our shakedown trip from Elkhart, where we took delivery of the Coach, back to UT we faced the engine smells, in addition to the transfer switch repeatedly tripping and huge leaks from the shower.
Our UT dealer DP Pusher tech sealed the engine access panel in the rear bath, replaced the transfer switch, it failed again last summer in VT, and discovered the shower drain wasn't connected to the plumbing system to properly drain to the gray tank.
The transfer switch was a supplier issue, but the other two were assembly and QC issues in the plant.
Still, that big picture window in the lounge was/is worth it! This is a good coach.
'17 Thor Tuscany 44MT;1200 solar watts/600AH Lifelines
'18 Colorado Z71 Centennial DuraMax Diesel