PS - here is the email regarding his reply:
In part:
Dear RipNC,
daglenn1960 has just replied to a thread you have subscribed to entitled - Losing water from the fresh water tank??? - in the General Discussions about our Montanas forum of Montana Owners Club - Keystone Montana 5th Wheel Forum.
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Had to remove about 6-8 nails on each side of the coroplast as well as the 4-way hitch/light plug (terribly mounted with a rear fiberglass cap) and the dozen or so screws across the rear that hold up the coroplast/rear. Not terrible (be sure to have a drill/driver and proper nut driver bit, plus a small nail puller). Pry the plastic washer thingie off the nail, spin the nails in reverse for a bit, get the pry tool under it and then spin it all the way out. Use self-tappers with fender washers (and maybe drill the nail hole a bit first) to replace. Had a nice paved, sloping site in Colorado to drop it in...