[f5fstop]

A person from Warranty Direct, the largest independent aftermarket auto warranty company explained to me at a meeting once how warranties are figured.
Basically, they are figures similar to life insurance, the greater the risk the higher the cost. However, the greater the risk does NOT mean that a vehicle is more likely to break, it might mean it has more expensive components and other risks.
Example, on a Corvette, an extended warranty is pretty expensive, from the insurance companies stats, the drivetrain is more likely to break due to abuse such as jackrabbit starts (note, laying rubber) which is hard on the trans and rear end, which are expensive to service.
People who drive family type cars are normally not as hard on a car as a sport enthusiast.
On a 4x4, you have an additional axle (front), plus a transfer case, and on some, a rather expensive rear locking diff.
I would also ASSUME, that with the Hummer models, they feel the people will most likely take them on extreme off-roads, more so than someone who drives a trailblazer.
A little over a year ago, I purchase a 5 year/100K, zero deductible, full warranty on my 2003 Corvette from Warranty Direct. It cost approx. $2400.00. The same warranty on a H3, issued by another aftermarket company would cost about $2800.00. Considering the extra components on the H3, I find this price in line with the Vette.