As mentioned above, my guess would be that its purpose is to help clear the back window of dust, etc., and to help keep exhaust out when running the the back window down. But I'm not "in the know", and am just guessing.
downforce no? that'd be my guess, these rigs are pretty light in rearend, keep rears planted better at higher speeds. regardless they look cool imo and wish my sr5 had one.
Regarding part of this, and not to be argumentative or derail the thread, but mine doesn't seem so light in the rear, and I love that. Why? Because mine never ceases to amaze me offroad, going places that I would never,
ever dare go in a 2WD pickup. I don't push my luck too far, have never gotten stuck, and saying that will probably jinx me, but I love how this thing handles rough terrain (hills, rocks, moderate mud, 18" deep creek crossings, etc.), and even snow/ice. I know, I know - next time I go offroad, I will get stuck and have to pull out my come-a-long and 200' of rope, that I
always keep in the back. :biggrin2:
Sorry for the side-track. Back to the actual topic now.