Other abilities that might work could be something inline with hammer "Vehicle Tracking" or "Tank Hunter Infantry Section Detection" or "Vehicle Detection".
or some sort heal or reinforce when near tanks.
Generally some ability that would increase the synergy of tanks and pgs.
I don't think it's a good idea to proliferate easy-to-access maphack-like abilities. Our machines are already paying a heavy toll to do that truesight thing. We should be having way fewer of that stuff; not more.
Something that would very well fit the theme of the unit is Hull Down. However, this is already taken by a doctrinal ability