How come that the site says that the 4wd model has a less roll over rating then the 2wd model?
The 4wd has a better rating than the 2wd. The 4wd is less likely to roll over than the 2wd, thus it has a better rating. That is because the 4wd has its center of gravity slightly lower than the 2wd because of the extra 250 pounds from the transfer case, three extra drive shafts, and the front differential housing.
Do you think the AWD mode had any thing to do with the ratings?
No, it has only to do with the lowered center of gravity. The Senior Safety Standards Engineer who wrote the Standard worked for me for ten years and then was promoted to have his own division. We talked about how to write the Standard and ratings tests alot before I retired two and a half years ago.
that site is not 100% correct. For both the 2wd and 4wd, the test vehicle shown did not have rollover stability control supposedly.......I am almost 100% sure that all the 07 and 08's come standard with the stability control system.
I have an 07 2wd with the truxxx leveling kit. Last week some idiot driving a mustang slammed her breaks on, from about 40 mph...while not using a blinker to turn across incoming traffic. I swerved to avoid running over the lady. I probably missed hitting her by a few inches, but at no time did I feel as if I was going to roll over or lose control. It was a quick jerk to the right and then a quick jerk back to the left to avoid hitting the curb. I felt the stability control kick in and my truck barely even felt like it was leaning at all. I was surprised how well it reacted.