I have the same type of rattle. But mine is due to the fact that the front skid(factory) is loose. My mech/sevice shop did not tell me that I only have two screws holding it in place. So you might want to check this also, especially if you have an older truck.
_________________________
2000 SE 4x4 (good bye)
Super Black
2007 Quest SL
2011 Titan CC Pro-4x (Smoke)
"The difference between death and taxes is death doesn't get worse every time Congress meets." -- Will Rogers (1879-1935)