I agree with Ivylog I to would wait to replace the washer/dryer. My wife likes the idea of puting in the clothes turn on and when done there done. No coming back taking out wet clothes and puting into the dryer. We have a 2005 Allegro Bus I will send you a PM.
I had one replaced a few year ago at my Cummins dealer on a 300hp 8.3. They sold me a good used on for $50.00. The real problem is when they change it out broke 6 of 12 bolts. Luckly they were able to get them all out without takeing off the head.
We was in Portland Or. last year. We bought a 2005 Allegro Bus from B Young RV they are a Tiffin Dealer. You can call them at 503-305-8685 ask for Carrie Turk see what she can do for you. If you call tell her that Santa sent you she will know who I am.