How do you setvehicle spawns or has that been turned off?

I am just trying to test out the scorpion on mouse and keyboard with the aim assist because I noticed i dont even think it turns on pc without that enabled and need to double check. but all i can do is start a custom and wait for vehicles to luckily spawn a scorpion is thats whats up? lol. thanks

EDIT: well anyway! I just turned the timer off and it takes about 15 mins and then they start dropping like crazy in BTB gametypes. but what got me wasn’t the tank it was the assisted steering on controller is checked off and i didnt realize it enabling my analog keyboard. so it was ALL GOOFY… lol. but does it count it says all wheeled steering? tanks have treads ect. a brute has a claw wheel? counts?