First of all, the clear film that is installed on the fronts of RVs is not the same as the vinyl graphics installed on many gel-coated RVs... these are two different products. CrystalTek is designed for vinyl graphics, not for the clear shield such as "Diamond Shield" or "3M Clear Shield".
Many companies use steam to remove these products while others have different methods. When this stuff starts to crack, it becomes very time consuming and with a lot of patience can take you several days. In most cases (not all), there's a good chance that some of the paint underneath could be lifted.