How do the vehicles spawning at objectives work?
Solution 1:
I believe it's just a timer for when the vehicle was destroyed, independent of what team controls the objective.
Here's a list of server defaults, and there are vehicle spawn delay table on Page 2 https://drive.google.com/file/d/0B8g9NtK6bcjMWjVITnZqVDZmc2c/view