I was with automotive car wash and wax with meguars wax. I have always waxed over my graphics and they still look great 14 years later. Caveat, I store indoors year round, your results may vary.
1998 Jayco Eagle 302FK (Honda EU3000is)
2016 GMC Sierra Denali 3500HD 4x4 Duramax/Allison
2003 Honda Aquatrax F-12X Turbo