It seems to me that the GV spawns do not cover a wide enough area or randomize the location of a spawning vehicle enough to prevent a single tank from completely shutting down a spawn area. Spawning ten times and getting killed before you can even rotate the gun on the enemy seems silly.
It's natural for folks to creep towards the spawn, wether to be first in line for the action in the case of multiple friendlies, or to narrow the area in which an enemy can be located. But that area shouldn't be a single point. This becomes a combat ender.
perhaps the spawn area can be widened, and placement insided it when Spawning can be more randomized.