It appears the side of your PUP is made of Filon it looks like the same material our PUP was made from.
Here is a website that may help you out.
As far as the decals you could contact Jayco and see if they still have your decals. Another place is ebay there are several people who sell decals there or even a local sign company that can match and make them for you.
Good luck on your project.