Congrats!
Have you checked out Outbackers.com specifically for Outback owners?
http://www.outbackers.com
Peeling decals is an issue with several brands of trailers. There are a lot of Outback-specific posts about it on there if you do a generic search.
Also, a quick call to Keystone customer service will also likely get you to the correct vendor to get an exact replacement set, depending on which specific ones you want to replace (can be pricey).
Best of luck with your new Outback!