Back when FSX was the norm and GSX had its own paint kit available, you could have still done that even then, but because of the way the texture layout was structured, it was a lot more work to do it, but it could be done. Basically, each vehicle had to have its own logo in FSX, whereas with the Render To Texture feature in P3D, you only need one for the ground handling equipment and one for the catering trucks. And, you don't have to add anything to the configuration file of each vehicle as you had to do in FSX.