I use meguiars wax on everything I own with good results. I store my camper indoors so it is out of the sun most of the time, because of that I only wax it once every two years. I do wash it after every outing though.
1998 Jayco Eagle 302FK (Honda EU3000is)
2016 GMC Sierra Denali 3500HD 4x4 Duramax/Allison
2003 Honda Aquatrax F-12X Turbo