The SCT X4 comes with pre-loaded tunes for many Ford vehicles, such as Mustangs, F-150's and Powerstrokes. The devices have a warning that they are not for use in California but that is simply because these pre-loaded tunes for other vehicles are not emissions compliant with California laws. We do not use these pre-loaded tunes for RV's so what we are loading into your engine computer is custom to the vehicle and will pass California emissions tests.
Most folks can load the tuning themselves or have a friend help. It only requires a Windows computer and an internet connection to download the tune. No special tools or mechanical abilities are necessary.