Hmm... Can the floor in the W/D cavity be removed. How about the drawer underneath- access through there? Access from the side via the rear closet? Also, outside, on the rear corner of the coach, is what appears to be a screened panel. What does that do?
We'll have to wait until someone who has experience with this on your coach chimes in.
Or, you could send a private message to iRV2 member "mchero." He has a 2007 Discovery 39V. His profile is here
. You can send him a private message by clicking on that profile's "Contact Info" tab and then on the "Send a private message to mchero."