One thing to think about is how you normally set up camp. I had a 19' CCD that had the WH on the Curb side. Didn't think of it much until I was at a campsite for more than a weekend, had the awning and camp chairs out, and reailized that before I ever turn on the WH, I needed to make sure that no chair or other combustables was in front of the WH.
I had a close call once, had the back of the chair right against the WH, and then went in for the nite. Got up the next morning and fired up the WH, and looked out the window and realized I needed to move the chair.
But, with your 27 footer, this may not be an issue.