Ok, noted! I have planned in the future a full vehicle pack, with tons of them, also animated.
What are exactly your needs related to the vehicles: more variety (trucks, motorcycles, etc)? Or just color changes?
Btw, I think is easy to flip the vehicle in your engine, tilesets usually tries to optimize the possibilities to avoid filling spritesheets with repeated assets. Try it and let me know if flipping them works for you :)
Thanks for the kind words and interest!