First of all, the Landstalker is absolutely not a Landrover, or an Explorer for that matter. I thought it was more a Japanese SUV, like a Mitsubishi Landcruiser.
I always thought the Rancher and the FBI Rancher were the same, only the FBI had an extended rear. I thought they were both Chevy Suburbans.
I would agree that the Stallion is a Mustang rip off. Anywhere from '66 to '69.
The Cheetah is in NO way a Lamborghini. Absolutely not. Definately not. It is a Ferrari of some sort.
I agree with the Banshee in GTA 3 and Vice City.