During multi people don't use a lot the concept of Infantry Fighting Vehicle with Troup Carrier like APC; these are light armored tanks with light/medium guns. It can carry troups, ensure they all get out in a safe spot(opposite of paradrop), then can cover infantry with decent fire. It can easily push on nested position with good timing.
ATGM, aka "Anti To Ground Missile" or DAGR "Directional Air to Ground Rocket" or Titan;
are fun to kill with at the first try.
They do shoot far away (depending of your object distance parameter relative to the server). They can shoot far far away... like 5 km without trouble. I'm considering playing with an APC at 2/3km view distance (Further away, I feel it a bit unfair as it rely on PC specs)

Troubleshooting/Suggestions
These toys rarely miss,
Even in dense vegetation. Specially when the shooter is way above the ground, ie 1km high. Does trees have hitboxes? Forest don't give cover they would. Suggestion#1 Increase Tree's hitbox for missiles, to ATOC 7.

These toys all have thermics,
which is not a bad idea at first glance. During mid day, ground must be around 50°C while bodies are colder. Also quick zoom/dezoom make the bodies glitch through structures for like 50ms.
Suggestion#2 nerf it by sunny daytime.

These toys don't warn
when being targeted with, most of grounds don't have iR detector or similar stuff. Troops won't use Gorgon, if they know they could be insta killed
Suggestion#3 Give APC directionnal iR detector for commander only(teamplay survivabilty improvement), or better info like air or ground independantly if the server says radar or not.

These toys cannot be dodged,
exept by cover, because you cannot use smoking device and run away.
Suggestion#4 Driver should have smoke action

These toys are fire and forget style
Suggestion#5 add more aerodynamic strafing effect to missiles so long distance shot won't be so easy
Suggestion#6 Nerf DAGR tracking. Add lock and tracking feature for DAGR, while not locking a target, it should not track it's movements. Not to mention DAGR rocket pods have plenty of ammo.

These toys don't require any skill to shoot, not even standing by.
Suggestion#7 Add a launcher that need a designator.

Radars which are totally OP,
helps to shoot flawlessly to the right spot. As in real world, radar have various modes with different scanning speed.
Suggestion#8 Nerf radar to 120/60° radius according to vehicule's tech
Note on Suggestion#1: When you're lurking into forest, ie a big fat Chernarus' one, radar DO still catch you all the time.

Suggestion#9 Add IFF Friend Or Enemy jammer for commander in some vehicule, using "battery ammo". Otherwise how radar can know so fast who's foe? This is to prevent insta locking far far away.
Suggestion#10 Add iR jammer for drones or commanders; some kind of active counter mesure, designed to avoid these obvious rockets which cross the map.
Suggestion#11 Remove radar detection if Engine not ignited/Hull cold (for me it's a bug to be detected while you're a passenger of an empty-crew tank)

My experience with tanks (light ones specially) was awesome on KOTH, because I've learned by fire, how to run them efficietly!
I really understand that Arma3 was launched as Alpha, and it was a good thing because BI needed solid funding campaign after bad press of A2, BUT now we need advanced features and more of all:
BALANCING pls
Balistic requires skills, on the other hand rocketry require knowledge of keybindings.
I don't want low/mid quality desynced mods/scripts, I suggest solid vanilla stuff.
I also really understand that Rockets are a Battlefield commercial asset to keep noobs being interested into gameplay (read a Frankie video about a Battlefield4 recent update), but now there is a solid community over A3 (: I don't want to act like "engeeneer of the finished work", but this is feedback report, I'm giving mine through hundred hours of Multiplayer (thousands to be precise^^)

Why it must be on VANILLA is because admins don't know how to tweak mission files in general, also I'm not considering game breaking assets(exept #10), only improve a vehicule that can be insta killed with 3 crews + 6 passengers... Nobody uses APC in multiplayer!