Our last coach had the stacked washer and dryer in the rear bath's corner. We thought it was a perfect location but it did vibrate a lot as there was only chassis below. Our current coach has it in the mid-ship hall. Same washer and dryer and it is much quieter from there. Since it is on the full wall slide, there is plenty of room to spread out the piles (around the corner into the bedroom). It is over the water waste tank, and supported to the rear by an axle. Twice in our previous coach, the water fittings shook themselves loose and caused water to leak. For that reason, we were very open to a mid-ship location when we looked for our new coach. Although it has worked well for us, I do understand why the rear corner is preferable for many.
Good luck with the search!
2015 Providence 42M, Toad - 2002 PT Cruiser with Air Force 1 brake system. Cummins 450 ISL 9L), Allison 6-spd transmission, Freightliner chassis