[Old Sarge]

Can't tell. Someone with vehicle stats, help us out.

I would think more along the lines of soil conditions, then anything else. Even the Hummers do the slide with this sugar sand.

[Darksheare]

The Stryker is notoriously unstable.
It has been restricted to improved road surfaces due to it's propensity to roll.

My favorite from the article: "Heavy rainfall in the area might have been a cause, but the Army is still investigating."
They should investigate the fact that the whistle blowers during it's development were silenced andf the program shoved forward regardless of it's obvious problems.

[Eagle Eye]

It's plain old mud, not sugar sand. Heavy rains, slick, sticky mud (yes, it's both at once) and poor roads all play a part. Not to mention that these guys just got in county and haven't adjusted to the terrain.