The manufacturers of the 3-rigs I have owned have all specified to use a quality marine/rv wax. So while a good car wax is better than no wax, IMHO and at least the 3-mfg's. I have spoken with, you would be better served going to a marine and or rv wax for better protection. MeGuiar's is a quality wax, car or marine/rv. I have used Meguiars Flagship marine wax for years and have been quite happy with the ease of application and the longevity. In reality you are pretty safe to go with any of the name brands as they should be pretty close in protective capability. Also the manufacturer of my new rig has also suggested using Protect All which I may try. A lot of folks speak of it's super easy application and protective capabilities. Worth a try.