Originally posted by: Novgrod
The cheetahs are bulletproof, but you can get one pretty easily. At just over 100 seconds (if memory serves) they'll come rushing by your hideout, going the wrong direction. If you block the road with a tour bus, angled, to push a cheetah into the ramp of your garage, you can get a bulletproof/explosionproof/flameproof cheetah just about every time.
Being particularly cheap, I decided to beat that mission with my (legit) tank. You can get infinite tanks after you've beaten the storyline of the game, or if you complete Emergency Vehicle Pickup.
I should note that there is an easy way and a hard way to get all the emergency vehicles. The FBI car and the tank are, of course, the hardest.
Both cars require a *lot* of work; you'll need a rocket launcher (ideally; it'll make things so much easier) and a bunch of police bribes.
If you're stuck in getting a legit tank/fbi car, PM me and I'll help you out though don't bother before you have 100 packages and 5-6 police bribes