We've had two Combo units, in our Montana and then our '12 RW, but not real long term in either. The stacked units in our current '16 have been almost full time use going on 6 years now. Only issue we had was the Factory pinched the discharge hose during install that we had to pull the washer out and re-route.
Michelle & Ann
2018 Chevy 3500HD Crew Cab High Country DRW, D/A, 2016 RW39MB, Dual ACs, Auto Level, Auto Sat Dish, Stack W/D, King Sleep #, 17.5" Sailuns w/Disc, MORryde IS & Pin, Comfort Ride Hitch, 5.5 Onan, Res Fridge & Induction Cook Top