As far as I know being neighbors with an SC Game Warden the skin on the Tahoe is not fictionalized it is completely accurate if it was on a Ford Truck or Chevy Truck but yes, as far as I know, they do not use tahoes. The Silverado, however, is completely accurate except for the round sticker on the back. This skin pack is based on the newer vehicle skins that SCDNR has put on their trucks.
Why would you say that the only skin that he made that's completely fictional is the technical rescue truck. The other two skins can be compared to actual SCDNR Vehicle skins.