Bought new June of 2008
Delam evident around spring of 2011 on rear bedroom slide.
Returned to dealer for repair, cost was going to be split between us.
Forest River saw the damage and decided to cover full cost of repair, (that's what I was told) poor sealing from the factory.
No problems since, my trailer has always been indoors during the snowy winter months (nov. to may) since new and it still took a couple years to appear.
Did have a small issue around fridge start to develop but was caught when a few bubbles the size of a thumb nail became evident (poor caulking around some mounting screws for the fridge). Dealer repaired under warranty.
Have had to "touch up" the self leveling the roof caulking a couple times over the last five years - beware or roof leaks!