I have a blog post about installing the washer. I don't know what model camper you have but mine is a 189 FBR with no slide. The wardrobe is exactly the right size for the washer. I moved the Wardrobe to the top where the TV was, move the TV to the foot of the bed, and put the washer in the bottom of what used to be the wardrobe.
wackypup.blogspot.com/2016/10/how-i-added-laundry-to-my-camper-and.html (you'll have to cut and paste. It won't let me put a link in this message)
In the blog post there is a link to the exact Haier washer that I bought. I love it I have been full time for about 2 months and have been doing 100% of our laundry in it, including the comforter. It is a thin small comforter, but it does a great job washing it. I don't think I would put a real queen-size comforter in it though LOL
I did do all the mods myself, I love building things for the camper. I have lots of projects on my blog, and a lot that I haven't written up yet.
I just made a picture album, and in one of the interior pictures you can see the little curtain that hides the washer. If you want to do this or anything else, and you want to bounce ideas around with me, I would love it. Thanks for your interest, I love talking about mods LOL