OK, So this is something that I requested too a lot when I was starting out. How to do stuff with regular units.
I used:
1 - Suicide Bomber
20 - Level 9 Razorbacks
14 - Level 5 Cobras
This is the first try of me attacking with this setup. So at times I was overcautious and other times I through caution to the wind, like when I hit a mine. I only lost 2 cobras, and they repair real quick. BTW, you have got to love the disconnect.
Brian, Here are my machine stats. I pulled these by running dxdiag.exe
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System Information
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Time of this report: 3/9/2013, 01:13:11
Operating System: Windows 8 Pro 64-bit (6.2, Build 9200) (9200.win8_gdr.130108-1504)
Language: English (Regional Setting: English)
System Manufacturer: To Be Filled By O.E.M. (AKA Custom Built PC)
System Model: To Be Filled By O.E.M. (AKA Custom Built PC)
BIOS: BIOS Date: 03/27/12 14:26:42 Ver: 04.06.04
Processor: AMD FX(tm)-8150 Eight-Core Processor (8 CPUs), ~3.6GHz
Memory: 8192MB RAM
Available OS Memory: 8172MB RAM
Page File: 2621MB
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.02.9200.16384 64bit Unicode
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Display Devices
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Card name: AMD Radeon HD 7800 Series
Manufacturer: Advanced Micro Devices, Inc.
Chip type: AMD Radeon Graphics Processor (0x6819)
DAC type: Internal DAC(400MHz)
Device Type: Full Device
Device Key: Enum\PCI\VEN_1002&DEV_6819&SUBSYS_25531458&REV_00
Dedicated Memory: 2029 MB
Yeah, I guess you could if you wanted to bait using one of the Razorbacks. But it seams like an expensive and weak unit to bait with when the suicide bomber is faster and can weather direct tank hits better. It should be noted that I wasn't trying to say that this is "the" way to do it but rather "a" way to do it. You see at my level I can't just un-upgrade a unit, and I am not going to violate the T.O.S. to create another account to make demonstration videos. Heck my Cobras are only leveled 1/2 way up at 5/10 (I knew I should have majored in math
); so, I guess it doesn't have to be 3/4 upgraded. Technically all you need is for your land based units to be level 6 and higher so that you can take advantage of their range. A level 6 Paladin could take out Machine gun turrets just fine also, but I like the extra range cushion that the razorbacks give and they take up less space. I think that's enough commentary on this one. It was just a video to demonstrate that Event Won units are not required to take down a level 30. And, when I was starting out with the game, the only videos that I could find had WarHawks and Elite Gatling trucks in them. I just wanted to fill a void with this where people really weren't creating videos for people that were just getting started and didn't have every event unit. Okay, for real this time, I am going to stop talking. 
PS, I think I hate being corrected, but...
Cabers, 3/10 (the actual level required to overcome the red machine gun turrets with RazorBacks) = 3/10 not 3/4 to use the same denominator it would be equal to 6/20 compared to 15/20 and an error of 150% off accuracy of the actual answer. Just Saying...
I cleared my first ss 40 at lvl 24, just had cobras at lvl 6.
Operation Warlord: Hellfire, Stinger, Honey Badger
Operation Crossfire: Hellstorm, elite gatling truck, Laser tank, Elite rifleman & elite Humvee
Operation Front Line: Plasma Turret, FAV's, Drone Silo, Reaper Drone, Elite Hellfire, Elite heavy gunner & gladiator
Operation Archangel: Enforcer, Valks & Elite Valks
Operation Halcyon: Elite Laser, Gats schematic, shock tank
Operation Deadpoint: Elite Glad, Laser schematic, elite shock tank, Elite mega tank, Napalm turret, Ionized heavy armor & Ionized armor
Advanced Mission Rewards: Colossus, Havoc, Behemoth & Vanguard
Event Prizes: Honey Badger, Hellstorm, Flak Tank, Attack Dog, Elite Hellfire, Elite Riflemen, Plasma Cannon, Gladiator, Drone Silo, Shock Troopers, Gatling Truck, Stinger, Elite Mega, Napalm, Crusader, Elite Laser, Elite Valkyrie,Elite Heavy Gunner)
Advanced Mission Prizes : Collosus, Havoc, Behemoth
Trust me you are not skilled enough. Especially if you are saying that you are in an open forum. LOL... Nube
When they add the watch towers it made it very difficult to affective use cobras. If you want to go at it with Air you will need a Havok to sponge the damage or Hellstorm to outrange it.
marš svi u kinu pička li vam materna
Dude, 8 core processor.
Nice!