Washer/Dryer Prep
We have a 2018 Miramar 35.3, same as Metalgator. We've not had as many issues as them, and really enjoy ours. As far as the washer/dryer prep, it is behind the removeable panel on the left side of the closet, mid-way up. The water lines w/valves and the drain line are there. There are also separate breaker protected receptacles for the washer and dryer if using stackables. We used a combo vented model and are very pleased with and recommend it. You will have to cut a hole through the side wall of the motorhome for the vent, just double check your measurements before drilling.