OP, sounds like you already contacted the factory when you said they don't have decals for a 2008 trailer?
Maybe find a used one on a dealer's lot that is a year or 2 newer and grab the VIN off of it and give that to the factory parts rep? Contact them by email: Sheri Dunlap, email@example.com
2011 Rockwood Signature Ultra Lite 8293SS, 12K Equal-i-zer
2016 Ford F-250 XLT SuperCrew, 6.2L, 4x4, 6'9" bed, 3.73
2010 Rockwood Roo 23SS (2012 - 2014)
2009 Ford F-150 XLT SuperCrew, 5.4L, 4x4, 5'6" bed (2012 - 2016)