Engine stall or limited slip?

[H3 Hummer]

On the way home I made a right hand turn on red, it was tight so I barely bumped the tire (but did none the less). The truck stopped and wouldn't proceed. For the second I started thinking where to pull over, I was only going about 5 MPH. Then the H3 started back as normal like nothing happened.

So on my BMW Z3 I have the traction control (limited slip) like the H3. I am very used to how it responds especially when wet. Anyway, the H3 acted the same way, but only over a little bump on the curb.

It felt like the truck was turned off - so I ask is this normal for a little bumb to do this? If so how do any of us go off-roading?

This may be more of a explain and educate me issue opposed to a mechanical problem. Somthing just doesn't seem right though.