I not for sure on the warranty issues, but I think if it is under warranty they should cover it, unless it shows a lot of abuse to the part that broke.
You may want to call your service manager at your dealership, and see what they have to say about warranty.
I my self would say your truck should be ok for a day of sand driving, and you should not have any problems.
As a rule of thumb : If you get into a area that your not to sure of, get out and walk the area, and look things over, befor driving through it.
Last thing. Go Out And Have Fun In The H3.
And take lots of pictures.
