Majority of the War Commander’s community think that the only units you should use is Megatanks and Cobras which is dead wrong. It is not as effective as using a well balanced army of support vehicles against Rogue Forces or Players. The advantage of playing this way, it allows for you rebound your army faster and to have a lot more flexibility when it comes to defenses guarding the base instead of relying on brute force. Remember there is more than one way to skin a cat.
Rocket Buggy (It speeds allows for it to outpace Mortar Shells, Vehicles, and Infantry.)
Razorbacks (Its range alone allows for it to outrange majority of the obstacles, except for Mortar Towers which can reach them.)
Laser Tanks (Because of its sheer power and range, the laser tanks can be a real life saver when it comes to dealing with Hercules/Infantry/Ambushes.)
What to Use
Razorbacks vs. Buildings, Stand-Ground Infantry or Vehicles, Bunker, and Gun Turrets
Cobras vs. Rhinos/Paladins/Challengers/Megatanks and Mortar Towers
Laser Tanks vs. Infantry, Hercules or Gatling Trucks, Bunker, and Buildings in General
If Units are not Stand-Ground, lure them outside the base's defenses.
Use single Rocket Buggy's to pull Tanks from base into Cobra's waiting outside the base.
Use Rocket Buggy to distract Mortars if they can hit Razorbacks while you are aiming for Gun Turret.
Use a single paladin/challenger/megatank to soak up damage for Laser Tanks, while the Laser Tanks deal the damage.
If the enemy has Hercules or Gatling Truck, use a single Cobra to lure the Hercules into Laser Tanks while a single paladin/challenger/megatank soak up the damage.
If the enemy's Hercules or Gatling Truck are Stand-Ground, use Razorbacks to out-range them and destroy them.
Anytime you decide to spring a trap against a unit, place your trap outside the range of Gun Turrets or Mortar Towers.
Never enter the base, use long range support units to deal damage, eliminate the threat of mines inside the base.
Laser Tanks and Razorbacks are Support Vehicles, pair them up with paladin/challenger/megatank to protect them.
When all obstacles are eliminated, use eight laser tanks (With Max Deploy) to finish off the base, it is fast and clean to the boot.
Personal Note:If you have any questions regarding anything I have stated, please ask away and I will be happy to explain to you in detail.