Donna D is correct in contacting a local designer/vehicle wrap/vinyl shop.
With Covid still kicking at all of us, the following may help for the time being.
So after reading your post, I looked at both Pinterest as well as Instagram respectively:
https://www.pinterest.ca/search/pins...yped&term_meta[]=custom%7Ctyped&term_meta[]=rv%7Ctyped&term_meta[]=graphics%7Ctyped
https://www.instagram.com/explore/tags/rvgraphics/
Lots of ideas to wet your inner designing whistle...and your mouse's exploration skills.