I have a 3rd gen, so no fancy downhill assist for me. Use 2nd and then low gear to slow you down. When that isn't enough, drop into 4lo and that reduction in gear ratios will slow you down, as well.

I used every trick I had to get down a steep grade with switchbacks this last weekend in the Washington and Jefferson National Forest. I put the transfer case into 4lo, put the transmission into low, and used my brakes as sparingly as possible, but as much as necessary. I also stopped half way down for about five minutes to let the brakes cool off. I'd rather take it slow than realize I'm experiencing brake fade halfway down a dangerous-as-hell decline.