Default vs Custom vehicle settings

[NiteStalker]

Map: Sidewinder

Using sparkedit, I did not change any of the vehicle settings. I noticed that there were two tanks on each side. When I created gametype, setting both red and blue's vehicle settings to default, the tanks were not there. When I set it using Custom and put 4 vehicles per side, then the tanks appeared.

Question: Why is this? Am I able to change vehicle default settings? If so, then how?

[gundamzuki]

By default, the map does not have vehicles in it, but it's designed so that if you want to, you can have them without modifying it. Kinda like the default weapons set is AR and pistol, but you can switch to heavy and start with a RL.