Decals for trailers prior to about 2015 or 2016 were not made with the same printing process, inks and vinyl that more recent models are using. On the "luxury grade" Keystone products in 2012 to about 2016, Keystone offered a 5 year decal warranty. On the "standard grade trailers" (with their cheaper decals) Keystone didn't cover the decals past the 1 year trailer warranty.
Your trailer is "well beyond the 5 year warranty and I wouldn't expect Keystone to offer any assistance other than possibly selling you replacement decals at outrageous prices. There are several members who are involved with commercial printing companies and in the past they have posted that the average lifespan for "upgraded, quality decals and vehicle wraps" is about 7-8 years under ideal conditions. UV exposure in Arizona is far from "ideal conditions" so I'd suspect that even the most expensive vinyl graphics would last much over 5-6 years, if you're lucky.....
That said, there are local printing companies that can make you replacement decals, some offer "artistic services" and can design graphics that meet your creative ideas. Or, EBay has a large selection of RV graphics, some OEM, many aftermarket, much of which is far less expensive than buying OEM graphics from Keystone or a dealer outlet.
If you do an EBay search for "ALPINE TRAILER DECALS" you'll get several choices, some of which may be what you are looking for. Many are 10% of the Keystone retail pricing.
https://www.ebay.com/sch/i.html?_fro...ecals&_sacat=0