Pending the year of your camper or if you do not care if they are an exact year match, EBay has some Sunline decals for sale.
Or you can try a local sign shop to make custom decals for you. The EBay places are signs shops who made some and are just selling them on the EBay site. I have bought some with good success.
Hope this helps
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club