Al,
I don't think that Tellico is the place for your friend to try out his new truck. JMHO.
He will need to get some skid plates, as I know that Ford stopped putting them on in 2000. Tow points are also something he will need to get, as well as recovery gear, i.e..tow straps etc...
The stock Explorer is quite good for off roading, but not up to the calibar of Tellico. I'm sure that you can find somewhere else that isn't quite that bad.
Tell your friend good luck.