We have a 2013 Key Largo. Included in our coach is the YETI Package which includes fiberglass insulation under waste water tanks to help keep tanks and under belly space warmer. As our waste water tanks fill our under belly grows and bulges out and downward. I had this issue looked at twice by two different repair shops recently and all they could find was a broken waste water tank bracket which was repaired. Last week a friend pointed out to me again the extreme bulge downward again. I am looking for ideas and suggestions. Is this normal or is there an underlying problem. I hate to have to personally take down the coroplast again since it is tightly sealed by the last repair shop.