Instead of creating a new mod for each vehicle, you could make a mod, where you can customise which vehicle you want to have on demand. To do this, I would think about an ini file or external program. :)

@Kryo4lex It's funny you say that, i am currently working on this exact idea but thanks for the input, greatly appreciated.

Great Minds think alike :)

@iiTzKraze Make sure to make it an ini or bring up a dialogue asking for Vehicle model. Just to save time so instead of going through trainers to get the dialogue just hit one key :)

@Derpy-Canadian i have already made the mod : https://www.gta5-mods.com/scripts/vehicle-on-demand
Also if you dont mind, could you shed some light on how to make it bring up a dialogue box so user don't have to leave the game to change the vehicle.

also i want to be abel to bring up the dialogue box via a cheatstring if thats possible.

@iiTzKraze yeah let me grab the code from one of my mods. Here is what I found

string blipName = Game.GetUserInput(30);

and idk if this is for it but here

if (String.IsNullOrWhiteSpace(blipName)) return;

@Derpy-Canadian i sent you a private message

Though there are more mod like trainers that got more features like this but I still appreciate your work well done ;)