You guys are whining about game mechanics when the solution is simple.
Learn. To. Play.
No offense to anyone, but most of the complaints around here is based around people having no clue what to do.
Whining about heavy tanks being stunned, infantry being OP, artillery being OP, etc etc etc.
If you see a group of carriers driving towards you, does it really hurt so bad to leave your current position for just half a minute to kill them?
I mean, I can take out two T-80's easily with 4 infantry units if they stand still. They're asking to get killed.
I'll now give you the solution on both sides.
If you're infantry rushing, and the enemy is moving back, use more infantry to counter. If you get killed, try to spread out a bit. It's usually the blast radius that kills you (Assuming you got a large group of carriers near eachother)
Use the main road to get to your target, using infantry rush (or spam) always have the faster vehicles. If you want the armed variants, try sticking to planting infantry in forests, side lines etc.
Victims of rushes. Make sure you deploy some units within 3000 radius of the main road (1.5k to each side, this is to avoid being hit by infantry once they deploy,)
If your main tank (Let's assume an expensive T-80), move it BACK. It's the main focus.
Always have units to support your expensive tanks (If you did not know this already, don't come whining about OP game mechanics, these are not grim reapers. Tanks are fragile, no matter how expensive)
Zhalo's are good example of a perfect vehicle for this task. Always keep units at the rear, spread out and have an in-depth attack. Don't create a line formation, retreat your outer units (Those more than 2000m away) down the line and follow up with the infantry, move those at the start of the line backwards until the infantry stops at the 2nd layer of defense (Previous mentioned units further than 2000m away)
I'd make you a drawing for easier understanding, but eh.. Yeah.
Main thing you need to worry about is if the enemy spam is aiming for your third layer (The zhalo's at the sides) then you need to move the 2nd layer (Units 2k+ M away) closer to take those out while retreating with the zhalos to avoid high amounts of damage.
Stop the first layer of defense (The heavy / expensive tank on the main road) once the spammer aims for the side defenses, and help them kill off remaining targets. Do not engage in actual combat with it if you see carriers moving towards you, even a few well placed missiles can take you out, do not take the risk.
If everything goes flawlessly you've lost nothing to a zhalo or two.
If things goes well you've taken out their forces with only a couple of loss in tanks / zhalo's from the mainly the third layer, maybe the second.
If it goes bad you've lost what's mentioned above and maybe some AA units or similar support.
You've failed if you lost your heavy tank.
If you can't be bothered having these long lines of defense when you move forward, do this. Cut off the second layer as that's usually the one hardest to have (I usually use recon vehicles with a proper punching gun and mid-range costing tanks of 40~) and replace it by some of your own infantry. Just keep them behind your heavy tank, once the spammer is spotted, move back your units, deploy your infantry & good luck (I'd prefer flame infantry, or infantry with HE power of 2, or high accuracy. Anything stronger than the regular 10-20 costing infantry the enemy may spam)
This is the lazy method, but it may or may not work.